C. cure liver cancer.
D. treat skin cancer.
【答案】:B
38. Some athletes use caffeine to
A. improve their speed.
B. increase their endurance.
C. maintain their alertness.
D. relax their muscles.
【答案】:B
39. Caffeine withdrawal symptoms
A. can become an ongoing problem.
B. may last as long as a week.
C. are weight loss and mental disorder.
D. are usually short-lived.
【答案】:D
40. Drinking three cups of coffee a day
A. may not be recommended by most doctors.
B. is harmful to healthy people.
C. will probably not cause problems.
D. may benefit sensitive people.
【答案】:C
第三篇
Some People Do Not Taste Salt Like Others
Low-salt foods may be harder for some people to like than others, according to a study by a Penn State College of Agricultural Sciences food scientist. The research indicates that genetic factors influence some of the difference in the levels of salt we like to eat.
Those conclusions are important because recent, well-publicized efforts to reduce the salt content in food have left many people struggling to accept fare that simply does not taste as good to them as it does to others, pointed out John Hayes, assistant professor of food science, who was lead investigator on the study.
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