单项选择题

During his lifetime he was able to accumulate quite a fortune,（）

A.control
B.spend
C.collect
D.exchange

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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
We all consider him a man of dynamic personalities.（）

A. dangerous
B. doubtful
C. active
D. easy
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