单项选择题

It is common experience that a certain amount of regular exercise improves health and contributes to a feeling of well-being（）

A．共同经历一定量的练习可以增进健康，并使人感到富有。
B．一定量的运动锻炼可以增进健康并使人快乐，这一点是人们共有的。
C．人们共同的经历肯定练习会改进健康，并对财富有贡献。
D．一定量的运动可以增进健康并使人精神愉快，这一点是人们共有的经验。

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单项选择题

The word inhibited (ParA．2) in this passage probably means（）

A. unable to have good manners
B. unable to express freely or relax
C. able to act properly
D. able to talk freely

单项选择题

Why does land become desert after all trees are cut down（）

A．Because nothing remains on land except floods.
B．Because there are no longer trees to keep the rain and protect the top-soil.
C．Because too much rain sinks in and washes away the top-soil.
D．Because roots of the trees break up the soil.