单项选择题

Efforts to reach the injured men have been ______ because of a sudden deterioration in weather conditions.

A．enforced
B．intensified
C．continued
D．strengthened
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单项选择题
Two trucks were reported to have ______ head-on yesterday.
A．bumped
B．crashed
C．collided
D．struck
单项选择题
The degree of economic growth is an ______ of the level of living.
A．index
B．advantage
C．access
D．aspect
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