请教OG

ken178 · 发表于 2010-7-16 16:14:14

"Life expectancy" is the average age at death of the entire live-born population. In the middle of the nineteenth
century, life expectancy in North America was 40 years, wherreas now it is nearly 80 years. Thus, in those days,
people must have been considered old at an age that we now consider the prime of life.

C. Many of the people who live to an advanced age today do so only because of medical technology that was
unknown in the nineteenth century.
D. The propotion of people who die in their seventies is significantly smaller today than is the proportiion of people
who die in their eighties.

今天重新做OG，想问问这两个选项如何支持argument???想不明白

sunflower82 · 发表于 2010-7-16 18:24:32

你好像没有把题目说全，我记得不是这样的。原题是下面哪个答案weeken了argument，但不说明其它答案是support argument的，也可以是无关选项。这是做题目最基本的逻辑。这两个答案是无关选项。

ken178 · 发表于 2010-7-20 12:16:37

哦，不是的，我知道这题是要求WEAKEN，但是这两个选项在OG的解释是SUPPORT的，我是不明白这两个选项如何起到支持作用。

请教OG

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