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
I've never ______ the theory that people am more important than animals.
A．subscribed to
B．hung on
C．engaged in
D．indulged in
单项选择题
New data has ______ that the damage to the ozone layer is not confined to the southern hemi- sphere.
A．ratified
B．confirmed
C．assured
D．approved
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