单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
Why may chocolate help people prevent heart disease

A．Because it contains little fat.
B．Because it contains flavonoids.
C．Because it is so tasty.
D．Because it contains lots of vitamin.

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. Why may chocolate help people prevent heart disease 您的浏览器不支持 audio 元素。