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

Their parents once lived under very severe conditions.()

A. sound
B. hard
C. strict
D. tight

单项选择题

They strolled around the lake for an hour or so.()

A. ran
B. rolled
C. walked
D. raced

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