单项选择题

The policemen acted quickly because lives were at stake.（）

A. in danger
B. in difficulty
C. in despair
D. out of control

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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
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
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