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
According to the author, one will become obsessive-compulsive ______.
A．if he washes his hands every time he touches a surface
B．if he only washes his hands with soap and water
C．if he could not win over the bacteria in his home
D．if he does not fight against the bacteria at home
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
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