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.
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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
A．have been sittingB．had been sittingC．sitD．am sitting
A．have been sitting
B．had been sitting
C．sit
D．am sitting
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