单项选择题

Three years have______since we last met at the conference for conternet communication in Beijing.

A．elapsed
B．discerned
C．discontented
D．electrified
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单项选择题
The population in last area was growing rapidly. Needless to say, the housing problem there cried out for immediate solution.
A．tried hard to find
B．called loudly
C．needed very much
D．asked earnestly for
单项选择题
The incidence of this disease has been greatly reduced thanks to our health care pro- gram.
A．seriousness
B．frequency of occurrence
C．mortality
D．cure rate
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