单项选择题

A．and could possibly cause deathB．and had rather mild e……

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

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 doctor in Singapore performed a valuable service by ______.

A．finding the subgroup of the virus
B．developing a cure
C．keeping his patients apart from others
D．reporting the outbreak to W. H. O.

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