问答题

目前老龄化现象很严重 2. 这种现象可能产生的社会影响和后果 3. 你的建议 On Aging Population

【参考答案】

[范文] On Aging Population Entering the 21......

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单项选择题
The CALERIE study is a turning point in the research field in ______.
A．studying the effect of calorie restriction on human beings instead of animals
B．having subjects with a wide range of age and weight
C．proving the positive effect of calorie restriction on prolonging people's life
D．excluding the positive effect of obesity reduction on keeping health
单项选择题
What can we learn about the subjects in the CALERIE study
A．They were selected by the National Institutes of Health.
B．They were divided into two groups according to their sex and age.
C．Half of them became thinner after the study.
D．They received periodical medical checks during the 6 months.
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