[解析] 在计算机网络、IDC机房中，其网络传输速率的单位用b/s(比特每秒)(或bit/s，有时也写作bps(bit per second)。所以A项是正确的。带宽的实际含义是在给定时间等条件下流过特定区域的最大数据位数。所以C、D项也是正确的。影响带宽容量的因素有很多，比如网络设备(交换机、路由器、集线器)；数据类型；用户的数量；客户机与服务器(如系统总线、磁盘性能、网络适配器、硬件防火墙)；电力系统和自然灾害引起的故障率。所以B项是不对的。
三、英语阅读理解题 We once had a poster competition in our fifth grade art class. "You could win prizes' our teacher told us as she wrote the poster information on the blackboard. She passed out sheets of construction paper while continuing, "The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster. We studied the board critically. Some of us looked with one eye and held up certain colors against the blackboard, rocking the sheets to the right or left while we conjured up our designs. Others twisted their hair around their fingers or chewed their erasers while deep in thought. We had plans for that ten-dollar grand prize, each and every one of us. I'm going to spend mine on candies, one hopeful would announce, while another practiced looking serious, wise and rich. Everyone in the class made a poster. Some of us used parts of those fancy paper napkins, while others used nothing but colored construction paper. Some of us used big designs, and some of us preferred to gather our art tidily down in one corner of our poster and let the space draw the viewer's attention to it. Some of us would wander past the good students' desks and then return to our own projects with a growing sense of hopelessness. It was yet another grown-up trick of the soil they seemed especially fond of making all of us believe we had a fair chance, and then always—rewarding the same old winners. I believe I drew a sailboat, but I can't say that with any certainty. I made it. I admired it. I determined it to be the very best of all of the posters I had seen, and then I turned it in. Minutes passed. No one came along to give me the grand prize, and then someone distracted me, and I probably never would have thought about that poster again. I was still sitting at my desk, thinking, What poster? When the teacher gave me an envelope with a ten-dollar bill in it and everyone in the class applauded for me.
1. What was the teacher's requirement for the poster? ______
A.It must appear in time
B.It must be done in class
C.It must be done on a construction sheet
D.It must include the words on the blackboard
A B C D
D
[解析] 细节理解题。由第二段末句，老师说的话“You just have to make sure that the words on the blackboard appear somewhere on your poster”可知。
2. The underlined phrase in paragraph 3 most probably means ______.
A.formed an idea for
B.made an outline for
C.made some space for
D.chose some colors for
A B C D
A
[解析] 词义猜测题。上下句是Some...Other...句式，“while we conjured up our designs"的对应部分是“while deep in thought”，可见conjured up的意思是“思考，想象”，故选A。
3. After the teacher's words, all the students in the class ______.
A.looked very serious
B.thought they would be rich
C.began to think about their design
D.began to play games
A B C D
C
[解析] 细节理解题。由第三段可知。
4. After seeing the good students' designs, some students ______.
A.loved their own designs more
B.thought they had a fair chance
C.put their own designs in a comer
D.thought they would not win the prize
A B C D
D
[解析] 细节理解题。由第四段倒数第二句“Some of us would wander past the good students' desks and then return to our own projects with a growing sense of hopelessness”可知。
5. We can infer from the passage that the author ______.
A.enjoyed grown-up tricks very much
B.loved poster competitions very much
C.felt surprised to win the competition
D.became wise and rich after the competition
A B C D
C
[解析] 推理判断题。由“always—always—rewarding the same old winners," " I can't say that with any certainty”和“I probably never would have thought about that poster again等可推断出，作者对得奖还是惊讶的。
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