单项选择题

From Paragraph 5 the author emphasizes ______.

A．the danger of viruses
B．the common existence of virus particles
C．the short life span of viruses
D．the difficulty in killing viruses
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单项选择题
In the first sentence of Paragraph 4, . manage this means to manage the process of ______
A．killing the bacteria in your body
B．multiplying to a significantly large number
C．raising the room temperature
D．sterilizing the perishable food
单项选择题
The word bug used in Paragraph 5 means ______.
A．a bacterium
B．a cold
C．a flu
D．a virus
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