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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单项选择题
The treaty will be the______ of lasting peace, thus it wins high praise.
A．potential
B．enclosure
C．tribute
D．threshold
单项选择题
The heavily populated area was a breeding place for______ diseases.
A．powerful
B．infectious
C．influential
D．suspicious
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