单项选择题

What is the main idea of the passage

A．All senses have their limitations.
B．Insects are more sensitive to colour than man.
C．Man has not fully utilized all his senses.
D．Man is not as good as animals in learning about the environment.

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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

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