lsat 5-2-21

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.

如果B是正确答案，C又怎么不对了呢？如果high blood cholesterol  also weaken artery walls 怎么办,晕了

如果B是正确答案，C又怎么不对了呢？如果high blood cholesterol  also weaken artery walls 怎么办,晕了

NN啊，題目裡已經有這句「low blood cholesterol weakens artery walls」了， High blood cholesterol 怎麼會weaken artery walls呢？C自然是不對地。

B選項是根據結論句西方食物比東方食物能預防低血脂毛病，因此西方食物是含有較高膽固醇、能提高血脂肪的。

這題討厭是在於，題幹很長，但實際有用的，只有結論句。

Let’s analysis this question:

Premise 1: The public is well aware that high blood cholesterol levels raise the risk of stroke caused by blood clots.

Premise 2: 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.

Premise 3: 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.

Conclusion: 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?

Assumption type of question, you have to find the other premises that make the argument valid

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

Out of scope, not talking about healthy food here.
            

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

This linked the premise and conclusion together, since the premises only talk about cholesterol level and the conclusion talk about the western and none-western food. So, you need an answer link those two elements together.

One trick of doing assumption type of question is to that the right answer will have the element that never shows up in premise. This question is a good example of it.   

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

 This answer has nothing to do with conclusion of this argument.

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

out of scope, not comparing which one is more dangerous in the argument.

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

blood pressure never mentioned in argument, so, out of scope.