单项选择题

The polar regions are generally covered with ice and snow.

A．areas
B．rocks
C．mountains
D．seas
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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
单项选择题
A fossil is a remnant of a once-living organism.
A．bone
B．solvent
C．picture
D．vestige
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