单项选择题

A．initiation
B．evidence
C．incidence
D．indication
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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
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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