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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Enamel, the hardest substance in a human being's body, covers the entire crown of the tooth.
A. whole
B. inseparable
C. superficial
D. main
单项选择题
Grouping stars by constellations is a handy way of mapping the sky.
A. nice
B. funny
C. manual
D. convenient
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