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  3. What is the main idea of this passage? Which of the following is the substance mentioned that helps to protect against heart di

What is the main idea of this passage? Which of the following is the substance mentioned that helps to protect against heart di

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问题 What is the main idea of this passage?
Which of the following is the substance mentioned that helps to protect against heart disease?
选项 A、Lipoproteins.
B、Cholesterol.
C、Both.
D、Neither.
答案A
解析 细节题。根据在第三段“Studies have shown that moderate drinkers have higher levels of highdensity lipoproteins in their blood．This is the“good”cholesterol that protects against heart disease．”。
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大学英语四级

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