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.
B. At any given time, all the Earth’s rivers have about the same salt levels.
C. There are salts that leach into the Earth’s oceans directly from the ocean floor.
D. There is no method superior to that based on salt levels for estimating the maximum age of the Earth’s oceans.
E. None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
Answer: A
刚才看了个讨论贴大家都在讨论A和E....但是做为一个选了B的人....
我觉得...Which of the following is an assumption on which the argument depends?
上面的讨论是在下面那个假设的基础上成立的？
我觉得很明显是在所有河水含盐量不变的情况下成立的撒。。。。所以B
Which of the following is an assumption on which the argument depends?
究竟是啥意思？？？啥意思？？
也就是说，首先理解题目基本原理是速度*时间=距离（类似的）
关键词最重要。past hundred years ＆ max age
这简直就是考细心程度嘛~~作者: Cherliuiking 时间: 2013-6-15 17:52
加强型的假设
A、have not been unusually large ，就是没有异常波动的意思，注意原文over the past hundred years 符合
B、have about the same salt levels.，太苛刻，要求含盐量基本不变，注意At any given time与原文over the past hundred years 冲突
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