单项选择题

The army maintains a constant sea and air______ even there are no war for may years.

A．patrol
B．patron
C．patent
D．pasture
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单项选择题
Steven began his work with______ and soon cut the tree up into logs.
A．vigor
B．verge
C．void
D．vein
单项选择题
There are just as many protons in the nucleus as electrons______ around it.
A．revolving
B．spinning
C．rotating
D．spiraling
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