单项选择题

We can learn from the passage that ______.

A．repellents work in three ways
B．repellents work more than giving off a nasty smell
C．scientists discovered smell is the mosquito's strongest sense
D．scientists have found some practical ways to avoid being bitten by the mosquito

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单项选择题

Situational loneliness has made it possible for people ______.

A．to keep fit
B．to adjust to the new circumstances
C．to cause sleeplessness and headaches
D．to understand that their shyness can not be got hold of

单项选择题

Which of the following is NOT truer

A．There are three distinct stages in a mosquito's attack.
B．Scientists discovered mosquitoes prefer to live in dry places.
C．The best way to avoid being attacked by a mosquito is impractical.
D．Repellents keep mosquitoes from attacking its prey by giving off a nasty smell and confusing them.