lsat－5－2－21

dalunzi

21. The public is well aware that high blood cholesterol levels raise the risk of stroke caused by blood clots. But a recent report concludes that people with low blood cholesterol levels are at increased risk of the other lethal type of stroke – cerebral hemorrhage, caused when a brain artery bursts. The report suggests that because blood cholesterol plays a vital role in maintaining cell membranes, low blood cholesterol weakens artery walls, making them prone to rupture. The conclusion thus supports a long-standing contention by Japanese researchers that Western diets better protect against cerebral hemorrhage than do non-Western diets.

The argument is based on which one of the following assumptions?

(A) Western diets are healthier than non-Western diets.

(B) Western diets result in higher blood cholesterol levels than do non-Western diets.

(C) High blood cholesterol levels preclude the weakening of artery walls.

(D) Cerebral hemorrhages are more dangerous than strokes caused by blood clots.

(E) People who have low blood pressure are at increased risk of cerebral hemorrhage.

在B和C之间徘徊。不明白B为什么不对，如果说B更像归纳题的答案的话，觉得C也差不多。两个都不像典型的假设题答案。

new_new

题目的推导关系是：low blood cholesterol levels（设为A）------>a brain artery bursts（B）------->cerebral hemorrhage（C）

但是C的答案是preclude the weakening of artery walls，也就是由非B推出非C，不能成立。

dalunzi

new_new ，那你认为答案是哪个呢？书上给的标准答案是C。

题目的推导关系是：low blood cholesterol levels（设为A）------>a brain artery weaken(B)－－－》artery bursts（C）------->cerebral hemorrhage（D）  接着作者结论：在protect against cerebral hemorrhage上，Western diets better than  non-Western diets。

为什么Western diets好，当然是因为答案B，所以我觉得B更像归纳。

而C则是对low blood cholesterol levels（设为A）------>a brain artery weaken(B)推导过程的一种假设，所以我觉得它作为答案有些牵强，它和结论一点关系都扯不上。只是从“假设”的角度上来说比B好一点。

所以我还是困惑，希望大家继续指点。

new_new

我晕，我的答案是B，书上给的答案就是B啊。。。。。？？？？难道我们手里的答案还不一样？

lawyer_1

答案为B。这是典型的GAP

原文推理： low blood cholesterol levels 易引起cerebral hemorrhage。所以Western diets better protect against cerebral hemorrhage than do non-Western diets。C和结论无关

dalunzi

谢谢各位，我的书上答案给的C,所以......

我的书在新东方门口游击队手里买的，该不会其它答案也有问题吧。尤其是想到我做完的8套已经全部对过答案。今天发现这题是因为答案错了，那其它认为已经搞定的题......

汗！！！