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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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
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
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