What is the main idea of the passage?

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问题 What is the main idea of the passage?
New studies say that eating chocolate may be good for your heart. Research shows that eating chocolate may reduce the chance of developing heart disease by helping blood vessels remain clear and open. Chocolate is produced from beans that contain large amounts of natural substances called flavonoids. Flavonoids have been shown to protect the heart and the blood vessels from being damaged. Recent studies have linked foods that contain flavonoid with a reduced chance of developing heart disease. These foods include tea, red wine, apples, peanuts and chocolate.
    The flavonoids in chocolate are more powerful than some vitamins in limiting the damage from fats in the blood. The flavonoid in chocolate also could stop damage to blood vessel walls. Researchers also carried out studies about flavonoid. The studies showed that foods high in flavonoid might help stop thickening of the blood that can lead to heart attacks or strokes.
    Researchers gave water, cocoa or nonalcoholic red wine to groups of ten men and women. Researchers tested their blood a few hours later. Both the wine and cocoa delayed the time it took for the blood to become solid. Some of the studies about chocolate are paid for by the Mars company which makes many kinds of chocolate candy. All the researchers agreed that many more studies are needed to confirm their findings.

选项 A、Chocolate may reduce the chance of developing heart disease.
B、The food that contains vitamins is good for heart.
C、The foods such as tea, apples, red wines can protect the heart from damage.
D、Red wine helps protect the wall of blood vessels.

答案A

解析 主旨大意题。主旨句一般都出现在文章的开头部分,考生需要抓住关键词。文章开始提到“…eating chocolate may be good for your heart”,巧克力能保护我们的心脏,然后文章解释巧克力里含有的物质对心脏有益。
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