单项选择题

Two trucks were reported to have ______ head-on yesterday.

A．bumped
B．crashed
C．collided
D．struck
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单项选择题
The man went to prison, but the two boys ______ with a warning.
A．took off
B．got off
C．kept off
D．set off
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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