单项选择题

Which of the following is TRUE

A．Man is more colour-conscious than the honey-bee.
B．The honey-bee is blind to red.
C．The honey-bee can see far more colours than man.
D．Man is sensitive to the ultra-violet.

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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

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%.