单项选择题

If it is left______, this fast spreading disease is likely to affect millions of Asian and African children, including more and more injured grown-ups.

A．unchecked
B．uncontrolled
C．aggravated
D．contaminated
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单项选择题
He______ a well meant but unsuccessful campaign to ease East West tensions calling for arms reduction and a summit of the nuclear powers.
A．embarked on
B．reckoned on
C．caught on
D．dwelt on
单项选择题
A doctor's obligation when he can no longer______ the approach of death is to make the patient comfortable, including easing his pain.
A．hang around
B．hang on
C．hold back
D．hold on
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