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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热门试题

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

单项选择题The author's attitude to the best way to avoid being bitten is ______.

A．positive
B．negative
C．worried
D．indifferent