Part 1 Reading Comprehension(35 minutes)
Directions: There are 4 passages in this part. Each passage is
followed by some questions or unfinished statements. For each
of them there are four choices marked A), B), C), and D). You
should decide on the best choice and mark the corresponding
letter on the Answer Sheet with a single line through the center.

Questions 1 to 5 are based on the following passage:

It was once believed that being overweight was healthy, but
nowadays few people subscribe to this viewpoint. While many
people are fighting the battle to reduce weight, studies are being conducted concerning the appetite and how it is controlled by both emotional and biochemical factors. Some of the conclusions of these studies may give insights into how to deal with weight problems. For example, when several hundred people were asked about their eating habits in times of stress, 44 percent said they reacted to stressful situations by eating. Further investigations with both humans and animals indicated that it is not food which relieves tension but rather the act of chewing.

A test in which subjects were blindfolded showed that obese(肥胖)
people have a keener sense of taste and crave（渴望） more
flavorful food than non-obese people. When deprived of the variety and intensity of tastes, obese people are not satisfied and consequently eat more to fulfill this need. Blood samples taken from people after they were shown a picture of food revealed that overweight people reacted with an increase in blood insulin（胰岛素）, a chemical associated with appetite. This did not happen to average-weight people.

In another experiment, results showed that certain people have a
specific, biologically induced hunger for carbohydrate（糖类）.
Eating carbohydrates raises the level of serotonin, a neurotransmitter in the brain. Enough serotonin produces a sense of satiation（满足),and hunger for carbohydrates subsides.

Exercise has