单项选择题

The river widens considerably as it begins to turn west.

A．extends
B．stretches
C．broadens
D．bends
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A great deal has been done to remedy the situation.
A．maintain
B．improve
C．preserve
D．protect
单项选择题
The food is insufficient for three people.
A．scarce
B．short
C．marginal
D．inadequate
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