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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单项选择题
One reason why the outbreak of the disease was not discovered sooner was that ______.
A．China did not belong to W. H. O.
B．doctors in Asia did not recognize the disease
C．reporting procedures were not good enough
D．the people who caught it were travellers
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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