单项选择题

There are notices to the contrary, a great deal of technical writing is at best awkward and at worst actually unclear.

A. denials
B. laws
C. attempts
D. ideas
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The polar regions are generally covered with ice and snow.
A. areas
B. rocks
C. mountains
D. seas
单项选择题
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
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