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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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
Many forms of cancer can be cured if detected early（）

A. selected
B. operated
C. developed
D. discovered
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