单项选择题

What happened to Senator Stems could happen to ______.

A．other old men
B．other senators
C．other politicians
D．anyone in the United States
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单项选择题
The type of influenza discussed in this story ______.
A．had been classified years before
B．could not be cured by any known drug
C．could be prevented from spreading
D．could not affect adults
单项选择题
One interesting thing about the virus in the story was that it ______.
A．was especially weak
B．was similar to other viruses
C．could reproduce at great speed
D．had samples frozen and packed in dry ice
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