27. Dr.Smith was always ______ the poor and the sick, often providing them with free medical care.
A.reminded of
B.absorbed in
C.tended by
D.concerned about
A B C D
D
[解析] 句意：史密斯先生总是关心穷人和病人，经常向他们提供免费的医疗帮助。本题的题干是两个并列的部分组成的，前一个为“concerned about the poor and the sick”，后一个为“providing them with free medical care”，concerned“关心，涉及，影响”。
28. We arrived at work in the morning and found that somebody ______ into the office during the night.
31. The report ______ was read with interest by businessmen.
A.about the fiscal crisis
B.for the fiscal crisis
C.on the fiscal crisis
D.regard to the fiscal crisis
A B C D
C
[解析] 句意：商人们饶有兴趣地阅读了那份关于财政危机的报告。介词on与about都有“关于”的意思，其区别在于about侧重叙事，on侧重论述；on表示专业的或内容详细的，指比较有系统地或理论性较强地论述某事，而about表示业余的或内容简单的，指泛泛地或非正式地谈论某事。如：It is a book on birds.那是一本论及鸟类的书。(可能是一本学术著作)和It is a book about birds. 那是一本关于鸟类的书。(可能是一本供小孩看的故事书)。for“为了，至于，因为”；regard常用于as regard或with/in regard to，表示“关于”。此处是指关于财政危机的报告，且目标读者是商人，所以应该具有很强的专业性，C项符合句意。
32. The company's pay equity analysis ensures that compensation is ______ for employees in the same job, at the same level, location and performance.
33. It's too risky to grow soybeans, and the income is less ______ than growing corn. In other words, you don't lose money growing corn. Soybean yields are too low.
37. The company says it will no longer design or launch artificial intelligence (AI) for weapons or other technologies whose main purpose is to cause ______ to people.
38. Last weekend, Barclay Department Stores reduced prices so much that customers were practically breaking ______ the doors to get to the bargains.
A.up
B.down
C.out
D.into
A B C D
B
[解析] 句意：上周末，巴克莱百货公司大幅降价，以至于顾客们几乎破门而入，来抢购打折商品。break up“分裂，解散，瓦解”；break down“(机器、车辆等)出故障，拆除”，break down the door意为“破门而入”；break out“(战争、殴斗、疾病等)突然爆发”；break into“突然开始做某事，强行闯入”，后面常跟house等建筑物。结合语境，可知本题选B。
39. The United States, which is a ______ of the Middle East peace talks, says Israeli settlements are an obstacle to peace, and the issue has strained relations with Israel's right-wing government.
40. A recent survey by the University of Aurora Business School ______ that three out of every four new businesses are started with funds from personal saving accounts.
二、阅读理解 We often take a militaristic, "tough" approach to resilience and grit. We imagine a marine slogging through the mud, a boxer going one more round, or a football player picking himself up off the turf for one more play. We believe that the longer we tough it out, the tougher we are, and therefore the more successful we will be. However, this entire conception is scientifically inaccurate. The very lack of a recovery period is dramatically holding back our collective ability to be resilient and successful. Research has found that there is a direct correlation between lack of recovery and increased incidence of health and safety problems. And lack of recovery—whether by disrupting sleep with thoughts of work or having continuous cognitive arousal by watching our phones—is costing our companies $ 62 billion a year (that's billion, not million) in lost productivity. The misconception of resilience is often bred from an early age. Parents trying to teach their children resilience might celebrate a high school student staying up until 3 a. m. to finish a science fair project. What a distortion of resilience! A resilient child is a well-rested one. When an exhausted student goes to school, he risks hurting everyone on the road with his impaired driving; he doesn't have the cognitive resources to do well on his English test; he has lower self-control with his friends; and at home, he is moody with his parents. Overwork and exhaustion are the opposite of resilience. And the bad habits we learn when we're young only magnify when we hit the workforce. The key to resilience is trying really hard, then stopping, recovering, and then trying again. This conclusion is based on biology. Homeostasis is a fundamental biological concept describing the ability of the brain to continuously restore and sustain well-being. Positive neuroscientist Brent Furl from Texas A&M University coined the term "homeostatic value" to describe the value that certain actions have for creating equilibrium, and thus well-being, in the body. When the body is out of alignment from overworking, we waste a vast amount of mental and physical resources trying to return to balance before we can move forward. If you have too much time in the performance zone, you need more time in the recovery zone, otherwise you risk burnout. Mustering your resources to "try hard" requires burning energy in order to overcome your currently low arousal level. This is called up regulation. It also exacerbates exhaustion. Thus the more imbalanced we become due to overworking, the more value there is in activities that allow us to return to a state of balance. The value of a recovery period rises in proportion to the amount of work required of us. So how do we recover and build resilience? Most people assume that if you stop doing a task like answering emails or writing a paper, that your brain will naturally recover, such that when you start again later in the day or the next morning, you'll have your energy back. But surely everyone reading this has had times where you lie in bed for hours, unable to fall asleep because your brain is thinking about work. If you lie in bed for eight hours, you may have rested, but you can still feel exhausted the next day. Because your brain has not received a break from high mental arousal states.
1. According to the passage, what is the relationship between recovery and resilience? ______
A.Without the ability to be resilient, it will be more difficult for us to recover.
B.Our ability to be resilient is negatively affected if there is no chance to recover.
C.The more recovery time we have, the more resilient we will be.
D.The increase of health and safety problems is usually caused by lack of recovery.
A B C D
B
[解析] 推断题。题干：根据文章，恢复和韧性之间有什么关系? A项“没有韧性，我们会更难恢复”，文中并没有提到没有韧性恢复会怎样，故A项错误。文章第二段第一句提到The ver lack of a recover period is dramatically holding back our collective ability to be resilient and successful(缺少恢复期会大大抑制我们的韧性，降低成功几率)，由此可知，如果不能适时恢复，我们的韧性就会受到影响，故B项“如果没有恢复的机会，我们的韧性会受到负面影响”正确。文中只是说要获得韧性，工作一段时间之后需要有一定的恢复期，并且工作的时间越长，需要越多的恢复，但是并没有说恢复的时间越长，韧性就越好，故C项“我们的恢复时间越长，我们的韧性就越好”排除。D项“健康和安全问题的增多通常是由于缺乏恢复”并没有说明恢复和韧性之间的关系，属于答非所问，故排除。综上所述，本题选B。
2. What do you think is the authors' attitude by saying "What a distortion of resilience!"? ______
A.They understand it is the parents' way to teach resilience.
B.They think it just represents part of what resilience means.
C.They think resilience cannot be taught by other people.
D.They think it is a totally wrong way to approach resilience.
A B C D
D
[解析] 推断题。题干：你认为作者通过说“这是对韧性多么扭曲的解释”传达的态度是什么? 根据题干定位到文章第三段。该段第一句The misconception of resilience is often bred from an early age. (对韧性的误解通常是从小就产生的)是该段的主旨句。根据本段可知，作者并不赞同让高中生熬夜学习以培养韧性的方法，这是解读韧性的一种完全错误的方法，故本题选D。 A项“他们明白这是父母培养孩子韧性的方式”，B项“他们认为这只是代表了韧性的部分含义”，C项“他们认为韧性是别人教不来的”均不是作者的态度。
3. Which of the following opinions is INCORRECT according to the 4th and 5th paragraph? ______
A.The key to resilience lies in pushing hard and also stopping for recovery, because if we worked too hard and our body will not find its balance back.
B.The homeostatic value of the activity for recovery increases as we have got more imbalanced from overworking.
C.We need to keep balance between working hard and recovery and the more we work, the more recovery we need.
D.Trying hard when you are exhausted will burn out your body, which will need more resources to get recovered.
A B C D
A
[解析] 细节题。题干：根据第四段和第五段，下面哪一个观点是不对的?本题可以采用排除法做题。 B项“当我们过度劳累，身体变得更加不平衡时，恢复活动的体内平衡值就会增加”，根据关键词“value”“overworking”，定位到第五段中的Thus the more imbalanced we become due to overworking, the more value there is in activities that allow us to return to a state of balance. The value of a recovery period rises in proportion to the amount of work required of us，由此可知，B项正确。 C项“我们需要保持努力工作和恢复的平衡，我们工作的越多，我们需要的恢复就越多”，根据第五段中的If you have too much time in the performance zone, you need more time in the recovery zone, otherwise you risk burnout...可知，工作量越大，我们需要的恢复就越多，故C项正确。 D项“当你已经很疲惫的时候仍然坚持，你就会精疲力竭，然后需要更多的资源才能恢复”，根据选项定位到第五段中的Mustering your resources to "try hard" requires burning energy in order to overcome your currently low arousal level...It also exacerbates exhaustion可知，在你需要恢复的时候仍坚持工作，就需要调动更多的精力，更加疲惫，所以D项正确。 综上所述，B、C、D三项均可排除，A项与原文第四段第一句“The key to resilience is trying really hard, then stopping, recovering, and then trying again”不符，且选项后半部分表述过于绝对。故本题选A。
4. What is the main message we can get from the 6th paragraph? ______
A.Rest or do other things can help us recover from working.
B.There is nothing much we can do to build resilience.
C.Stopping working and rest is not the same thing with recovery.
Modern scientists divide the process of dying into two stages—clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived. Biological death occurs when changes in the organism lead to the disintegration of vital cells and tissues. Death is then irreversible and final. Scientists have been seeking a way to prolong the period of clinical death so that the organism can be revived before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic sleep. By slowing down the body's metabolism, cooling delays the processes leading to biological death. To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientists put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining blood from its body. The monkey's blood pressure decreased and an hour later both the heart and breathing stopped clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into its body in the direction of the heart and started artificial breathing. After two minutes the monkey's heart became active once more. After fifteen minutes, spontaneous breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe and ran with it around the room. Her behavior differed little from that of a healthy animal.
6. This passage focuses on ______.
A.the difference between biological and clinical death
7. The best statement of the main idea of this passage is that ______.
A.scientists have found a way to prolong the period of clinical death
B.biological death occurs when vital organs have suffered permanent damage
C.modern scientists divide the process of dying into clinical and biological death
D.cooling delays the processes leading to biological death
A B C D
A
[解析] A项“科学家已找到延长临床死亡的办法”最能够体现全文主旨。
8. One characteristic of clinical death is ______.
A.lasting damage to the lungs
B.destruction of the tissues
C.temporary non-functioning of the heart
D.that the organism cannot be revived
A B C D
C
[解析] 根据第一段Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived可知，临床死亡是指机体的重要器官比如心、肺等停止运转，但是还没有遭到永久的损害，机体还可以复活。
9. According to the passage, cooling an organism ______.
A.speeds up the body's metabolism
B.slows disintegration of body tissues
C.prevents damage to organs
D.revives damaged organs
A B C D
B
[解析] 根据第二段By slowing down the body's metabolism, cooling delays the processes leading to biological death以及第一段可知，生物死亡是指机体的变化导致了重要细胞和组织的瓦解，冷冻减慢了机体新陈代谢的过程，因此也就延缓了通往生物死亡的过程，即延缓了机体组织瓦解的过程，因此答案为B。
10. One possible benefit of the experiment discussed in the passage is ______.
I've loved my mother's desk since I was just tall enough to see above the top of it as mother sat writing letters. Standing by her chair, looking at the ink bottle, pens, and white paper, I decided that the act of writing must be the more wonderful thing in the world. Years later, during her final illness, mother kept different things for my sister and brother. "But the desk," she'd said again, "it's for Elizabeth." I never saw her angry, never saw her cry. I knew she loved me she showed it in action. But as a young girl, I wanted heart-to-heart talks between mother and daughter. They never happened. And a gulf opened between us. I was "too emotional". But she lived "on the surface". As years passed I had my own family. I loved my mother and thanked her for our happy family. I wrote to her in careful words and asked her to let me know in any way she chose that she did forgive me. I posted the letter and waited for her answer. None came. My hope turned to disappointment, then little interest and, finally, peace—it seemed that nothing happened. I couldn't be sure that the letter had even got to mother. I only knew that I had written it, and I could stop trying to make her into someone she was not. Now the present of her desk told, as she'd never been able to, that she was pleased that writing was my chosen work. I cleaned the desk carefully and found some papers inside—a photo of my father and a one-page letter, folded and refolded many times. Give me an answer, my letter asks, in any way you choose. Mother, you always chose the act that speaks louder than words.
11. The writer began to love her mother's desk ______.
A.after mother died
B.before she became a writer
C.when she was a child
D.when mother gave it to her
A B C D
C
[解析] 根据全文第一句I've loved my mother's desk since I was just tall enough to see above the top of it as mother sat writing letters可知，作者当时还是个小孩子，故本题选C。
12. The passage shows that ______.
A.mother was cold on the surface but kind in her heart to her daughter
B.mother was too serious about everything her daughter had done
C.mother cared much about her daughter in words
D.mother wrote to her daughter in careful words
A B C D
A
[解析] 由第二段最后一句But she lived "on the surface"和全文内容可知，作者的母亲表面上很冷漠，但心里充满了对作者的爱，正确答案是A。
13. The word "gulf' in the passage means ______.
A.deep understanding between the old and the young
B.different ideas between the mother and the daughter
C.free talks between mother and daughter
D.part of the sea going far in land
A B C D
B
[解析] 从I was "too emotional". But she lived "on the surface" 可知此词是指两人之间不同的看法和观点，故本题选B。
14. What did mother do with her daughter's letter asking forgiveness? ______
A.She had never received the letter.
B.For years, she often talked about the letter.
C.She didn't forgive her daughter at all in all her life.
D.She read the letter again and again till she died.
A B C D
D
[解析] 根据最后一段...a photo of my father and a one-page letter, folded and refolded many times可知应选D。
15. What's the best title of the passage? ______
A.My Letter to Mother
B.Mother and Children
C.My Mother's Desk
D.Talks between Mother and Me
A B C D
C
[解析] 文章的开头I've loved my mother's desk...以及后面的Now the present of her desk told, as she'd never been able to...可知作者是托物思人，以表达自己对母亲的怀念之情，所以最佳标题应是C。
If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there. Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon. When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.
16. In the long run, the most difficult problem caused by population growth on earth will probably be the lack of ______.
17. Carl Sagan believes that Venus might be colonized from earth because ______.
A.it might be possible to change its atmosphere
B.its atmosphere is the same as the earth's
C.there is a good supply of water on Venus
D.the days on Venus are long enough
A B C D
A
[解析] 由第二段第一句中的it will be possible to change the atmosphere of Venus and so create a new world可知，so是表示因果的连接词，前因后果，所以正确答案为A。
18. On Venus there is a lot of ______.
A.water
B.carbon dioxide
C.carbon monoxide
D.oxygen
A B C D
B
[解析] 由第二段的最后一句话中的there is only a tiny amount of water there (Venus)得知，A项错误。第三段结尾说明，藻类通过火箭运往金星，然后In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon，说明金星上有大量的二氧化碳。C、D两项错误。
19. Algae are plants that can ______.
A.live in very hot temperatures
B.live in very cold temperatures
C.manufacture oxygen
D.all of the above
A B C D
D
[解析] 由第三段的第一句Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen可知，A、B、C三项均正确，故本题选D。
20. Man can eventually land on Venus only when ______.
A.the algae have done their work
B.the atmosphere becomes cooler
C.there is oxygen
D.it rains there
A B C D
D
[解析] 由最后一段中before man can set foot on Venus it will be necessary for the oxygen to produce rain可知，只有金星上有降雨，人类才最终有可能在上面着陆。
Advertisers tend to think big and perhaps this is why they're always coming in for criticism Their critics seem to resent them because they have a flair for self-promotion and because they have so much money to throw around. "It's iniquitous," they say, "that this entirely unproductive industry (if we can call it that) should absorb millions of pounds each year. It only goes to show how much profit the big companies are making. Why don't they stop advertising and reduce the price of their goods? After all, it's the consumer who pays ..." The poor old consumer! He'd have to pay a great deal more if advertising didn't create mass markets for products. It is precisely because of the heavy advertising that consumer goods are so cheap. But we get the wrong idea if we think the only purpose of advertising is to sell goods. Another equally important function is to inform. A great deal of the knowledge we have about household goods derives largely from the advertisements we read. Advertisements introduce us to new products or remind us of the existence of ones we already know about. Supposing you wanted to buy a washing machine, it is more than likely you would obtain details regarding performance, price, etc. , from an advertisement. Lots of people pretend that they never read advertisements, but this claim may be seriously doubted. It is hardly possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a newspaper would be like without advertisements. Would you enjoy gazing at a blank wall or reading railway bye-laws while waiting for a train? Would you like to read only closely printed columns of news in your daily paper? A cheerful, witty advertisement makes such a difference to a drab wall or a newspaper full of the daily ration of calamities. We must not forget, either, that advertising makes a positive contribution to our pockets. Newspapers, commercial radio and television companies could not subsist without this source of revenue. The fact that we pay so little for our daily paper, or can enjoy so many broadcast programmes is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price! Another thing we mustn't forget is the "small ads." which are in virtually every newspaper and magazine. What a tremendously useful service they perform for the community! Just about anything can be accomplished through these columns. For instance, you can find a job, buy or sell a house, announce a birth, marriage or death in what used to be called the "hatch, match and dispatch" column but by far the most fascinating section is the personal or "agony" column. No other item in a newspaper provides such entertaining reading or offers such a deep insight into human nature. It's the best advertisement for advertising there is!
21. What is the main idea of this passage? ______
A.Advertisement.
B.The benefits of advertisement.
C.Advertisers perform a useful service to communities.
23. Why do the critics criticize advertisers? ______
A.Because advertisers often brag.
B.Because critics think advertisement is a "waste of money".
C.Because customers are encouraged to buy more than necessary.
D.Because customers pay more.
A B C D
A
[解析] 第一段中第二句Their critics seem to resent them because they have a flair for self-promotion说批评是因为广告商太会自我吹嘘。A项说因为广告商经常吹牛，符合文章的意思。B项说因为广告浪费钱，虽然文中提到过，但不是批评的原因。C项说因为顾客被鼓励去买很多不需要的东西，属于推理过度。D项说因为顾客花的钱更多了，和B项一样不是批评的原因。
24. Which of the following is NOT true? ______
A.Advertisement makes contribution to our pockets and we may know everything.
B.We can buy what we want.
C.Good quality products don't need to be advertised.
The men who race the cars are generally small, with a tight, nervous look. They range from the early 20s to the middle 40s, and it is usually their nerves that go first. Fear is the driver's constant companion, and tragedy can be just a step behind. Scarcely a man in the 500 does not carry the scars of ancient crashes. The mark of the plastic surgeon is everywhere, and burned skin is common. Sometimes a driver's scars are invisible, part of his heritage. Two young drivers, Billy Vukovich and Gary Bettenhausen, raced in their first 500 in 1968. Less than 20 years before, their fathers also competed against one another on the Indy track—and died there. All this the drivers accept. Over the years, they have learned to trust their own techniques, reflexes, and courage. They depend, too, on a trusted servant—scientific engineering. Though they may not have had a great deal of schooling (an exception is New Zealand's Bruce McLaren, who has an engineering degree), many drivers are gifted mechanics, with a feeling for their engines that amount to kinship. A few top drivers have become extremely wealthy, with six-figure incomes from prize money, endorsements, and jobs with auto-product manufacturers. Some have businesses of their own. McLaren designs racing chassis (底盘). Dan Gurney's California factory manufactured the chassis of three of the first four ears in the 1968 Indy 500, including his own second place car. Yet money is not the only reason why men race cars. Perhaps it isn't even the major reason. Three-time Indy winner (1961.1964.1967) A.J. Foyt, for example, can frequently be found competing on dirty tracks in minor-league races, where money, crowds and safety features are limited, and only the danger is not. Why does he do it? Sometimes Foyt answers, "It's in my blood." Other times he says, "It is good practice." Now and then he replies, "Don't ask dumb questions."
26. The statement "it is usually their nerves that go first" means ______.
A.at first they all have a nervous look
B.they often find they can't bear the tension even if they are in good condition
C.someday they find they can't make responses to any risk
D.they can continue their career at most until the middle 40s
A B C D
B
[解析] 此句为过渡句，有承上启下的作用。第二段段首句Fear is the driver's constant companion, and tragedy can be just a step behind说明无论状态多好，赛车总会给车手带来无形的紧张情绪。
27. It can be inferred that a car accident is often coupled with ______.
A.a plastic surgeon
B.a companion
C.a risk
D.a fire
A B C D
D
[解析] 根据第二段“burned skin is common”可以推断出车祸通常伴随着起火，而A项的plastic surgeon是result of the car accident。故本题选D。
28. The invisible scars of the drivers mentioned in the second paragraph refers to ______.
A.the regrets left by their fathers
B.the fears left by their fathers
C.the cars left by their fathers
D.the heritage left by their fathers
A B C D
A
[解析] 本文讲的是赛车，第二段中讲到Two young drivers ...raced in their first 500 in 1968. Less than 20 years before, their fathers also competed against one another on the Indy track—and died there可知赛车手无形的伤疤指的是他们父亲留下的遗憾。
29. Bruce McLaren is different from most of the drivers in that ______.
A.he himself designs chassis
B.he has an engineering degree
C.he manufactures chassis
D.he is a gifted mechanic
A B C D
B
[解析] 由第三段括号里的内容an exception is New Zealand's Bruce McLaren, who has an engineering degree可知，different from所表达的意思与an exception相同，Bruce McLaren与其他赛车手的不同之处在于他有工程师学位。
30. A. J. Foyt often takes part in minor-league races for ______.
A.prize money
B.blood test
C.cheers from the crowd
D.enjoyment
A B C D
D
[解析] 此题定位在最后一段的结尾处，A. J. Foyt在三个不同时段给出了不同的答复“It's in my blood. ”“It is good practice. ”“Don't ask dumb questions. ”三者表达出的共同意思为enjoyment，所以D项符合题意。
(种)选法。男、女至少各一名的反面是全部为男生或者全部为女生，若所有参加竞赛的都是男生，则有
(种)选法；若所有参加竞赛的都是女生，则有1种选法。则男、女至少各有一名共有330-35-1=294(种)选法。故本题选D。
，乙每分钟走
，由于甲走了40-20=20(分钟)，共走了
的路程，则乙共走了
的路程，用时为
(分钟)，所以乙休息了40-15=25(分钟)。
的水，问：同时打开A、B口，需多长时间才能把蓄水池放干?______
，B每小时出水量为1÷1.5=
，当同时打开A、B口时，放水的相对速度为
，要将总容量的
的水放干，所需时间为
÷
=2(小时)，即120分钟。
，徒弟的工作效率比单独做时提高
。两人合作6天，完成全部工程的
，接着徒弟又单独做6天，这时这项工程还有
未完成，如果这项工程由师傅一人做，几天完成?______
，每天完成
。徒弟单独做了
，则徒弟每天完成
。已知徒弟合作时工作效率比单独做提高
，那么徒弟合作时每天完成
。师傅合作时的效率是每天做
，那么他单独做的效率为
，师傅单独完成这项工程需要33天。
。
取得好成绩”。已知“小贾没有取得好成绩”，否后推否前，可得“没有努力学习或没有得当的表扬”，根据选言命题推理规则，否定其中一个肢命题“没有努力学习”可以肯定另外一个肢命题“没有得当的表扬”，B项正确。故本题选B。
，______，0.375
。也可以将原数列所有的数改写为分数，依次为
。每一项的分子均为3，分母依次为1，2，(4)，8，后～项为前一项的2倍。故本题选B。
=3个“←”，1个“→”=2个“←”，换算后图形中均含有9个“←”，选项中只有C项符合。故本题选C。
担任过班级及以上学生干部。A项与题干逻辑关系一致。B项个例、C项“有些”均不能说明王强的情况，D项等值于“有些要参加选调生考试的人在大学期间担任过班级及以上学生干部”，也无法说明王强的情况。故本题选A。
=______。
计算各括号内分子之和，再化简，化简可得
=
。故本题选D。
=______。
可知，所求为
。故本题选B。
倍，说法正确。
，说法正确。
，说法正确。
，同比增速为-6.3%，下降最多，说法正确。
可知，同比增长率为
，说法错误。
深色：已答题 浅色：未答题