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

Lonely people have social contacts ______.

A．until they produce good health
B．because they can ask for help
C．but they think they do not have enough
D．and therefore they can get emotional support from their friends

单项选择题

What is the main idea of this passage

A．There are three different kinds of loneliness.
B．Chronic loneliness is the most severe kind.
C．Researchers want to cure loneliness.
D．There is some difference between being alone and being lonely.