The main idea of the text is ______. Which of the following is true according to the passage?

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问题 The main idea of the text is ______.
Which of the following is true according to the passage?

选项 A、If a person’s cholesterol is high, it won’t affect his health.
B、Heart disease is connected with the contents of cholesterol.
C、The Americans pay no attention to the action of McDonald’s.
D、Most of American foods are lower in trans-fatty acids.

答案B

解析 文章第二段最后指出,转基因脂肪酸和饱和脂肪酸提高了人体胆固醇的含量,增加患心脏病的危险。所以[D]正确,同时[A]错误。文章第四段第一句就说明了美国社会对McDonald’s的行为给予了很大的关注,因此排除[C];由原文知,McDonald’s和许多其他家的快餐油炸食品在转基因脂肪酸的含量上都是很高的,不然:McDonald’s不会要对其食用油进行更换,并且能够降低近一半的转基因脂肪酸的含量,故排除[D]。
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