2. 外语
  3. The passage suggests that if there were a slight global warming at the present time, it would be ______.

The passage suggests that if there were a slight global warming at the present time, it would be ______.

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问题 The passage suggests that if there were a slight global warming at the present time, it would be ______.
选项 A、easy to measure the exact increase in temperature because of the abundances of temperature recording stations throughout the world
B、difficult to prove that the warming was caused by the burning of fossil fuels
C、easy to demonstrate the effects of the warming on the water vapor in the atmosphere
D、difficult to measure the increase of CO2 in the atmosphere because of local variations in amount
答案B
解析 at random任意，随机地。句意：参加实验的人员完全是被随意地挑选出来的。at length最后，详细地；in essence本质上；in bulk散装，大量。
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