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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单项选择题
The room was furnished with the simplest essentials, a bed, a chair, and a table.（）

A. supplied
B. gathered
C. grasped
D. made
单项选择题
It is no use debating the relative merits of this policy.（）。

A. **
B. taking
C. discussing
D. expecting
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