单项选择题

A．a theftB．a burglary of a homeC．a muggingD．an arrest b……

"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 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

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