作者kenting15 (我不像我)
看板GMAT
标题[语文] gwd-12-Q29
时间Fri Jul 24 23:21:07 2009
GWD-12-Q29:
The Earth’s rivers constantly carry dissolved salts into its oceans.
Clearly, therefore, by taking the resulting increase in salt levels in the
oceans over the past hundred years and then determining how many centuries of
such increases it would have taken the oceans to reach current salt levels
from a hypothetical initial salt-free state, the maximum age of the Earth’s
oceans can be accurately estimated.
Which of the following is an assumption on which the argument depends?
A. The quantities of dissolved salts deposited by rivers in the Earth’s
oceans have not been unusually large during the past hundred years.
E. None of the salts carried into the Earth’s oceans by rivers are used up
by biological activity in the oceans.
答案是Ａ
我懂Ａ为何对
可是觉得Ｅ也对 如果海里的盐有任何生物作用而被消耗掉
也有可能改变盐度 造成实验不准确
谢谢～！
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1F：推 JoshReddick:A和E的差别在於"unususlly"，若有一种规律性的 07/24 23:42
2F：→ JoshReddick:bio-act会影响盐度的话，那预测地球的年纪时就有办法 07/24 23:44
3F：→ JoshReddick:把这影响考虑进去 07/24 23:45
4F：推 Calla:E不一对阿 即使过去一百年来盐巴有被消耗 这个消耗率只要是 07/25 00:00
5F：→ Calla:固定即可 如果盐巴完全不会被消耗掉 那大海应该会咸到爆炸 07/25 00:00
6F：→ Calla:所以就算会被消耗 只要速率差不多 还是可以用来计算地球年龄 07/25 00:01
7F：→ Calla: 大海的^ 07/25 00:02
8F：→ kenting15:谢谢~! 07/25 10:29