[問題]考古題 CR FORM 18 Q18

[dramaqueen]

A diet that contains polyunsaturated fats and is low in saturated fats reduces the risk of the risk of heart disease. Fish are an excellent source of omega-3, a polyunsaturated fat they obtain by eating the green plant cells of plankton. But cows and other ruminants obtain omega-3 polyunsaturates when they eat grass. Therefore, a diet rich in beef and a diet rich in fish should be equally effective in reducing the risk of heart disease.

Which of the following, if true, would weaken the conclusion above?

A) The diet of beef cattle can be monitored far more accurately than can the diet of fish.
B) Consuming polyunsaturates reduces the amount of cholesterol produced by the liver and reduces the chance of blockage in coronary blood vessels.
C) Studies have shown that people who eat fish only once a week have a lower risk of heart disease that do people who never eat fish.
D) Medical researchers are expected soon to make a synthetic from of omega-3 that can be injected into beef.
E) Cows and other ruminants convert most of the omega-3 polyunsaturates they consume into saturated fats.

ANS:E

我的想法是
A--把fish and beef相比較很奇怪
B--變support 原文
C--也是support 原文

D和E 就覺得很奇怪，請問該如何切入才對?

謝謝

[calendula]

因果结构的削弱，应找他因进行解答。
E选项说明牛等把不饱和脂肪酸在自身体内转化成了饱和脂肪酸，
所以自然跟鱼没法比了。