单项选择题

Proper exercise plays a significant role in the rehabilitation of patients with various back ailments.

A．operation
B．recovery
C．casting
D．relaxation
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单项选择题
The polar regions are generally covered with ice and snow.
A．areas
B．rocks
C．mountains
D．seas
单项选择题
It is not possible for people to remember everthing that they have thought.
A．recall
B．appreciate
C．repeat
D．discuss
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