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
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, during the Civil War the South no longer provided the North with ______.
A．cotton
B．shoes
C．hides
D．wool
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