单项选择题

In the past several years, the representatives of the two countries have met frequently to discuss ______ issues.

A．a cluster of
B．a host of
C．a flock of
D．a bunch of
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单项选择题
Common cold ______ neither age nor sex.
A．saves
B．covers
C．spares
D．causes
单项选择题
Excessive use of antibiotics is the chief cause of deafness and ______ muteness in children.
A．subsequent
B．continuous
C．consequent
D．successive
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