单项选择题

Normally a well-mixed diet can supply the vitamins necessary for a healthy body.

A．正常情况下如果饮食搭配合理，就可提供维持人体健康必需的各种维生素。
B．健康人体内的维生素都是由一般的搭配合理的饮食提供的。
C．一般的搭配合理的饮食都可保证对人体健康所需的各种维生素的供给。
D．一般的搭配合理的饮食和充足的维生素供应是维护身体健康必需的。
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