单项选择题

The water came in ______ bursts of hot and cold.

A．alternate
B．alternative
C．reciprocal
D．mutual
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单项选择题
I saw men ______ the streets with rifles on their backs.
A．pedaling
B．patrolling
C．paving
D．plastering
单项选择题
Basketball requires coach to teach athletes skills they are ______ in.
A．deficient
B．fragile
C．feeble
D．dreadful
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