单项选择题

Generally, the thicker a mammal's (哺乳动物) skin is, the less hair（）

A. that has it
B. That it has
C. has it
D. it has

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单项选择题

A．Not
B．No
C．None
D．Nor

单项选择题

A．very pleasant
B．very easy
C．full of amusement
D．interesting