单项选择题

Common cold ______ neither age nor sex.

A．saves
B．covers
C．spares
D．causes
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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
单项选择题
Brushing your teeth regularly helps to ward ______ tooth decay.
A．down
B．against
C．off
D．away
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