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.
这个题是用什么关系推出来的呀？为什么选A呢？
Q3:
The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia.Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed.However, recent statistics show a drop in the number of television assemblers in Borodia.Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.
Which of the following is an assumption on which the argument depends?
A.The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.
B.Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.
C.The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.
D.The number of televisions assembled annually in Vernland has increased significantly during the past three years.
E.The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years.
The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia.Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed.However, recent statistics show a drop in the number of television assemblers in Borodia.Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.
Which of the following is an assumption on which the argument depends?
A.The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.
B.Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.
C.The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.
D.The number of televisions assembled annually in Vernland has increased significantly during the past three years.
E.The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years.
这个题是OG上的吧？但是又做错了。。。选C，这个题的各个量之间的关系是什么？原文最开头提到平均小时工资有什么作用么？作者: yinshiqi 时间: 2011-12-4 21:54
这道题是挺难的，我第一次也是纠结于A和E，但后来想了后明白了到底怎么回事。。。先说B，大家质疑的最多的，At any given time, all the Earth’s rivers have about the same salt levels.这里的rivers是指同一个given time的，所以要求rivers都有一样的盐浓度是没有必要的，你们想的应该是不同时期的rivers盐浓度相同，这个有关，也有影响，但不是GMAC的人的想法。。。再说E，其实这个也很有迷惑性，但是其实used up一看我就觉得有问题，其实每个时期进入量by rivers和消耗量by biological activities的差值才是salt level的increase，有后面这个也是不影响各个时期的increase的，只要各个时期这个量近似相等，当然本题没有探讨这个问题，E只是提到了消耗量，但并不会因为没有这个assumption就没有了对应的conclusion。不知道我讲明白没有，大家可以借鉴下。。供以后的CDer参考。。
