第50题___________

A．Its opponents argue, however, that it will stop global warming.

B．Its opponents fear that it will damage the marine ecosystem, and now a computer model shows that the trick would also be remarkably inefficient.

C．As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed.

D．They found that 100 years later only between 2 and 11 per cent, of the extra carbon that was originally taken up by plankton had actually been removed from the atmosphere.

E．"These are newer and better models."

F．Ocean fertilisation is not the answer to global warming.

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参考答案

答案解析

看横线前后的内容，横线前面说“But the take-home message is the same．”，后面应该是对这个实验结果进行总结的一句话，而要填入的这句话也是本文的最后一句话。文章标题说“Don’t rely on plankton to save the planet(不要依靠浮游生物来拯救地球)”，这说明前面这些利用浮游生物的假设都是不合理的。剩下的只有A、F选项。A选项说它能够阻止全球变暖，这个与实际试验得出的结果刚好是矛盾的，所以不能够承接这里的意思。F选项说对海洋施肥不是解决全球变暖的办法。这个结果才是与实验结果匹配的，所以用这句话来进行总结，也刚好能够与文章标题相对应，所以本题答案为F选项。

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