再挑战一道

tocean0222

I choose A

the evidence: less percent of cyclists who entered this month's race finished within one hour than those who entered last month's race.

the conclusion:the course of this month's race is more difficult than that of last month's.

To strengthen this argument, the choice A gives an additional evidence that cyclists who entered last month's race also entered this month's,a fact implies that why fewer racers finished within one hour this month is not because of lower levels of permance by different cyclists,but because of other reasons, such as the course of this month's race is more difficult.Thus, the choice A give additional support to the conclusion.

albert

B很容易排除.

结论是由百分比得出了难度的结论...B的是绝对的数字,根本是无关,起不到支持作用.

mindfree

Joy,

You have a point here. However, I think that ETS has its way of critical thinking. In problems such as this one, to support the conclusion, ETS normally give an answer that rules out other possibilities (or another possibility) that contribute to the difference. For example, the answer can also be "two races are in the same weather condition" etc. But human factor is always the # 1 factor in considering this type of problems, as people can vary greatly in quality. So A is the best answer in ruling out the human factor.

B is not the right choice because you still have to make an assumption: these cyclists are of comparable quality. If one group is composed of professionals and the other amateurs, it will not support the argument. A does not need any additional assumption. And that is why it is the best choice.

hope it helps.

albert

我觉得即使参加的人具有可比性，人数在这里都是无关的。。人数再多，如果我两次百分比一样，你能说明因为PASS的人多了，说明考试难度减少了吗？

就象大学考试一样，看老师是否是杀手级的是看他关了百分之几的人。 人数对于衡量难度没有参考意义。