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
Mary is an active______ in social work. She spends much time staying with orphan children every summer.
A．patriot
B．pilgrim
C．participant
D．parasite
单项选择题
The fishing village, where lives 2000 fisherfolks. was on a small______ of the sea.
A．cape
B．inlet
C．port
D．gulf
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