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
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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
单项选择题
A．haven'tB．wasn'tC．don'tD．didn't I
A．haven't
B．wasn't
C．don't
D．didn't I
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