单项选择题

The physical problem that many adult Americans have is that（）

A．they are too slim
B．they work too hard
C．they are too fat
D．they lose too much body fat

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单项选择题

A．organize
B．manage
C．clean
D．use

问答题

每个人都知道，学习对一个人的成长是至关重要的。