单项选择题

All mammals have hair, but not always evident（）.

A．but it is not
B．but it is
C．but they are not
D．but they are

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单项选择题
The hard, out surface of the tooth is called enamel（）.

A．outside
B．appearance
C．outer
D．hiding
单项选择题
Not much people realize that apples have been cultivated for over 3,000 years（）.

A．Not many
B．Not enough
C．Without many
D．No many
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