21.government bans on the dumping of sludge anywhere in the ocean are based on the belief that the spread of sludge by ocean currents poses a danger to people.since it is not clear that sludge dumped on the ocean bottom, far from coasts,would endanger people, the bans should be revised to apply only to coastal waters each of the following, if true, supports the conclusion that the bans on ocean dumping should be revised except
B) Many locations on the ocean bottom far from coasts are geologically stable, and unlikely to be disrupted by earthquakes or volcanic eruptions. D)dumping large amounts of sludge would have an unknown effect on organisms that live on the ocean bottom. 答案是D，可以理解
问题是 B 如何支持了呀？ 我觉得B 是无关选项呢····
30.The human craving grom sweets was once benefical: it attacted people to foods that were healthful （ripe fruit ， for example ）in preference to foods that were not healthful （unripe fruit， for example ). However ， now that sugar has been refined, it follows that a craving for sweets is no longer benefical ， because refined sugar is not heathful 。
which of the following， if true ， would most strengthen the argument above ？
B)some people who crave sweets are more likely to eat a piece of ripened fruit than they are to eat a piece of candy . C)people who crave sweets are more likely to eat a food that contains refined sugar than a naturally sweet food like ripe fruit .
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发表于 2012-8-5 11:06:32
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