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
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
单项选择题
The youths probably shot Senator Stennis because ______.
A．he didn't have much money to give them
B．he laughed at them
C．they belonged to a different political party
D．he was not afraid of them
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