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

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单项选择题

Tuberculosis is highly infectious because ______.

A．spores are resistant to drying
B．the causative organism is encapsulated
C．droplets of sputum remain infective for a long time due to the resistance of the organisms to drying
D．none of these

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