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-Mr heating is better than steam heating because steam heating uses water
D．none of the above

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单项选择题

The passage uses the term vegetative forms to refer to ______.

A．plants that infest human habitations
B．the fact that bacteria are really vegetables
C．the growing stage of the bacteria as opposed to the dormant stage
D．the difficulty in classifying the . types of bacteria

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