单项选择题

These regulations ______ people under the age of 21.

A．include in
B．relate to
C．subject to
D．send in
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单项选择题
On the other side, the hill ______ more deeply.
A．slided
B．slippeed
C．slipped
D．sloped
单项选择题
Many artists ______ their subjects before putting paint to canvas.
A．snatch
B．sketch
C．ski
D．skate
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