单项选择题

We can realise how deeply a finger is put into water at body temperature ______.

A．from the sense of direct touch
B．through the skin contact
C．through the difference in temperature
D．from the even distribution of pressure
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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%.
单项选择题
A growing interest in sports developed after ______.
A．research showed their health benefits
B．people got the message from magazine covers and postage stamps
C．scientific evidence of health benefits was shown on TV ads
D．an increasing number of races were held in American cities
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