单项选择题

By "the nature of viruses" the author refers to ______.

A．shapes
B．characteristics
C．speed
D．self-sufficiency
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单项选择题
According to the passage , before microbes were discovered it was believed that some diseases were caused by ______.
A．germ-carrying insects
B．certain strains of bacteria
C．foul odors released from swamps
D．slimy creatures living near swamps
单项选择题
The author implies that bacteria were investigated earlier than viruses because ______.
A．viruses are found only in hot climates
B．viruses are extremely poisonous
C．bacteria are harder to eradicate
D．bacteria are easier to detect
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