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
The experiments in giving the virus to animals proved that this type of influenza was easy to catch ______.
A．and could possibly cause death
B．and had rather mild effects
C．but was not deadly
D．and did not have the usual signs
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