2. 外语
  3. A、Increase the sample number. B、Extend the time of the study. C、Observe the sample group of vegetarians. D、Both A and B. D短文中提到为

A、Increase the sample number. B、Extend the time of the study. C、Observe the sample group of vegetarians. D、Both A and B. D短文中提到为

admin2010-06-01  44
问题  
选项 A、Increase the sample number.
B、Extend the time of the study.
C、Observe the sample group of vegetarians.
D、Both A and B.
答案D
解析 短文中提到为了进一步检验他们的发现，they increased the sample number…The study was extended for a further six months，由此可知选项D为正确答案。
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大学英语四级

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