2. 外语
  3. Did Grandma seem forgetful at the holiday parties last month? It could be time to put her on a diet. Sharply【C1】______calories(卡

Did Grandma seem forgetful at the holiday parties last month? It could be time to put her on a diet. Sharply【C1】______calories(卡

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问题     Did Grandma seem forgetful at the holiday parties last month? It could be time to put her on a diet. Sharply【C1】______calories(卡路里)improves memory in older adults,according to a new study.
    Research on the benefits of an extremely low-calorie diet【C2】______back to the 1930s, when scientists found that rats lived【C3】______to twice as long when they ate less than control animals. And how about in human? To fill that【C4】______, scientist Agnes  and her colleagues at the University of Muenster【C5】______50 healthy elderly subjects. The【C6】______volunteer was 60 years old and overweight. The researchers【C7】______assigned the volunteers to one of three groups. Twenty people were instructed to reduce their daily calorie【C8】______by 30%, while still eating a【C9】______diet. Another 20 were told to keep their calorie intake the same but increase their【C10】______of unsaturated(不饱和的 )fatty acids. The【C11】______10 volunteers did not change their diets.
    After 3 months, all of the volunteers【C12】______a memory test in which they were shown 15 words and asked how many they could remember after 30 minutes.【C13】______average,those in the calorie-restriction group showed a 20%【C14】______over their baseline memory scores taken before they started their diets. Subjects in the other two groups showed【C15】______or no improvement. "Our study【C16】______provides some of the first【C17】______on the impact of calorie restriction on memory in the elderly, but this study has to be【C18】______up now," Floel noted. Her team plans to【C19】______larger studies to determine exactly【C20】______calorie restriction enhances memory.
【C5】
选项 A、registered
B、hired
C、recruited
D、enrolled
答案C
解析 考查动词辨义。该空所在句的subjects指“对象”，即科学家“招收”的实验对象，recruit表示“招收”，符合句意。register指“登记，注册”；hire指“招聘”，多用于工作方面；enroll指“入学；招纳新成员”，而此处只是招收研究对象，不是招收新的科学家，故不选。
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大学英语四级

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