单项选择题

According to the passage, the risk of infection from airborne microorganisms would likely be greater during a ______.

A．heat wave
B．time of high humidity
C．windless period
D．shortage of fuel oil
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单项选择题
It may be inferred from the passage that ______.
A．bacteria can be most easily killed by removal of moisture
B．drying out a house will eliminate the risk of airborne infection
C．hot-air heating is better than steam heating because steam heating uses water
D．none of the above
单项选择题
Those guys are continually quarrelling，but it is usually a storm in teacup.
A．不欢而散
B．小题大做
C．不可开交
D．无事生非
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