单项选择题

The phrase "sensitive skins" ( Para. 2) most probably means________.

A．skins that are quick to feel and respond
B．skins that are delicate
C．skins that are completely dry
D．skins that are sticky or slippery
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单项选择题
It can be learnt from the passage that the health benefits of exercise ______.
A．are yet to be proved
B．are to be further studied
C．are supported by scientific evidence
D．are self-evident
单项选择题
According to the passage, what was the percentage of American adults doing regular physical exercises two years ago
A．About 70%.
B．Nearly 60%.
C．Almost 50%.
D．More than 12%.
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