单项选择题

If you count from 1 to 100, how many 7s will you pass on the way
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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
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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