单项选择题

The phrase "homes in on its target" (Sentence 1, Para. 1) in the context means ______.

A．find its way to the intended victim
B．move towards the prey
C．set off for the target
D．aim at the victim
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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
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
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