标题: 求助一道不懂的逻辑 [打印本页] 作者: lllmmm 时间: 2011-3-27 10:38 标题: 求助一道不懂的逻辑 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.
E为什么不对呢？？？作者: sdcar2010 时间: 2011-3-27 11:06
If you see the word NONE, it is not an assumption. Too restrictive.作者: hellokitty2011 时间: 2011-3-27 11:38
这题答案是B么？作者: sdcar2010 时间: 2011-3-27 11:47
At any given time? Too restrictive.
The answer is AAAAAAAAAAaaa作者: 蚊子小猴 时间: 2011-6-2 12:35
If you see the word NONE, it is not an assumption. Too restrictive.