单项选择题

A．readily
B．suddenly
C．already
D．ready
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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
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
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