9. Shyness, the most common form of social anxiety, occurs when a person's apprehensions are so great that they inhibit his making an expected or desired social response.
Part Ⅱ Cloze Cancer is considered a modem disease, though it was not unknown in ancient times. (The condition was named by the Greeks from their word for crab, presumably because of its clawing, crablike growth). The incidence of cancer has risen dramatically in recent decades, primarily 1 cigarette smoking, and cancer is probably our most dreaded disease today. As a cause of death in the United States, cancer has climbed from less than 6 percent of all deaths in 1900 to over 20 percent today, 2 recent statistics. It is already the leading killer of women aged thirty to fifty-four. And add a killer of the overall population, it is second only to heart disease, 3 close to 430,000 deaths per year. This figure has risen annually since 1949, and if percent trends continue, cancer may well overtake heart disease as the number one cause of death. Can We Fight Cancer More Effectively Today? Although there is still much to be learned about cancer, our knowledge of the disease has grown steadily in recent years. We have a better understanding of the disease and are finding ways to 4 it. Early recognition of the signs of cancer, prompt diagnosis, and aggressive treatment by the appropriate means have made the word cancer less 5 than it used to be. Even people with forms of cancer that are still difficult to treat know that current techniques may 6 them to outwit the disease until improved treatment becomes available. Many cancer victims have hope where there was once despair. Even more important is the fact that some kinds of cancer are 7 caused by preventable factors—for example, 25 to 30 percent of all cancer deaths are related to cigarette smoking, and most skin cancer is caused by 8 exposure to the sun. Not all forms of cancer have such obvious associations, but where risk factors have been 9 , we can use this knowledge and attempt to reduce the odds of developing those particular forms of disease. You and the people you know can 10 your cancer risk as individuals.
Recent studies of the human brain have resulted in some interesting discoveries. Scientists believe that a way to improve the power of the brain may soon be possible. Scientists have discovered that the brain can make its own drugs. The brain 11 a protein substance which can act directly 12 the brain to change aspects of mental activity. Some may change or improve, for example, creativity, intelligence, imagination, and good 13 . Chemicals found in the brain 14 messages. In recent years scientists have found chemicals that 15 mood, memory and other happenings of the mind. About 25 have been found 16 . Today the role of chemicals and the protein substance in human behavior is creating much interest. Research seems to show that they may help 17 insomnia, pain, and mental illness. They have a great 18 to stimulate the brain to 19 deficiencies. They also improve the qualities of memory and learning already in the brain. They 20 the secret on mood and emotion. Some day there may be a chemical way to create a better and more efficient brain.