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　　1.单选题

　　【填句补文】Rough estimates in the past have predicted similarly disappointing results. ________ Says Sallie Chishol, an environmental engineer from the Massachusetts Institute of Technology. "But the take-home message is the same. Ocean fertilization is not the answer to global warming."

　　A、"These are newer and better models,"

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

　　C、Adding iron to patches of ocean can make plankton bloom temporarily.

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

　　正确答案：A

　　答案解析：这个问题可以根据引号来作答，因为空格后面有“says”这个词，它预示着所填入的句子应该是带引号的。A的意思是：这些是比较新的也是比较好的模型。

　　2.单选题

　　[阅读选择]On the other hand， on the moon there will be an attraction between the butter and the moon; but the butter will weigh only about one-sixth as much as it does on the earth. This is because the moon is so much smaller than the earth. The amount of gravitational pull that a body produces depends on the amount of material in it. A packet of butter has a gravitational pull of its own; but this is very small in relation to the pull of something as large as the moon， or the earth， or the sun.

　　We do not feel the gravitational pull of a packet of butter because

　　A、it is too small to have a gravitational pull of its own.

　　B、its pull is so small that we tend to ignore it.

　　C、its pull disappears in the presence of the earth‘s gravitation.

　　D、it tends to melt and loses its gravitational pull.

　　正确答案：B

　　答案解析：本题定位词是not feel…packet of butter，找到原文中A packet of butter has a gravitational pull of its own; but this is very small in relation to the pull of something as large as the moon, or the earth, or the sun.所以答案是B。C项错在disappear。

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