2. 外语
  3. It can be inferred from the first paragraph that ______. The CALERIE study is a turning point in the research field in ______.

It can be inferred from the first paragraph that ______. The CALERIE study is a turning point in the research field in ______.

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问题 It can be inferred from the first paragraph that ______.
The CALERIE study is a turning point in the research field in ______.
选项 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
答案D
解析 根据题干a turning point定位到原文第三段第一句a landmark。以往实验把肥胖者作为研究对象，而不是以体重正常的人为研究对象。肥胖能带来很多疾病，减肥自然有助于肥胖者的健康，但这不能说明calorie restriction对健康有利。而CALERIE在这一点上进行了改进，选择正常体重的人作为研究对象，排除了肥胖的干扰，这是这项研究的意义所在，D与之相符。 从第三段第二句可知，以往的实验也以人为研究对象，故排除A；B为无关选项，可直接排除；第四段实验只是证明calorie restriction有助于健康；是否能延长人的寿命不得而知，故排除C。
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