单项选择题

"It doesn't happen very often, but it does happen in the capital city of the United States." It refers to ______.

A．a theft
B．a burglary of a home
C．a mugging
D．an arrest by police
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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
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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