单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
A constant supply of nutrients for body requires ______.

A．enough vitamin only
B．a variety of foods
C．a rich breakfast
D．enough food

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单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. A constant supply of nutrients for body requires ______. 您的浏览器不支持 audio 元素。