求问FeiFei 135的第20题

michellefyj

20. A rise in the percentage of all 18-year-olds who were recruited by the armed services of a small republic between 1980 and 1986 correlates with a rise in the percentage of young people who dropped out of high school in that republic. Since 18-year-olds in the republic are generally either high school graduates or high school dropouts, the correlation leads to the conclusion that the republic’s recruitment rates for 18-year-olds depend substantially on recruitment rates for high school dropouts.


Which one of the following statements, if true, most weakens the argument?


A.A large number of 18-year-old high school graduates were recruited for the republic’s armed services in 1986 than in 1980.
B.Many of the high-technology systems used by the republic’s armed services can be operated only by individuals who have completed a high school education.
C.Between 1980 and 1986 the percentage of high school graduates among 18-year-olds recruited in the republic rose sharply.
D.Personnel of the republic’s armed services are strongly encouraged to finish their high school education.
E.The proportion of recruits who had completed at least two years of college education was greater in 1986 than in 1980.


请大牛帮忙看下，我看过解释版本里说，答案B是无关选项，C指出了false dilemma, 所以是正确的，没能理解啊！
题目意思应该是要削弱辍学人数比例提高和征兵入伍的比例提高之间的因果关系，但是C说的是，在1980年到1986年，高校毕业人数比例大幅提高。没能理解这个是怎么削弱的，求指点！！

yutong218

题目的结论是the conclusion that the republic’s recruitment rates for 18-year-olds depend substantially on recruitment rates for high school dropouts.

要削弱的是招募比例的提高是由高中辍学人数的提高引起的。

前面说Since 18-year-olds in the republic are generally either or high school dropouts,
所以不一定是由高中辍学人数的增加，也可能是high school graduates 的增加。

C选项正好指这个原因。

michellefyj

哦，恍然大悟了！
谢谢！