单项选择题

How does David feel about his role of being a father?
A、It is fun.
B、It is challenging.
C、It is comfortable.

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单项选择题

结构材料和功能材料是依据材料组成来划分的。

A.正确
B.错误

单项选择题

(5.0分)

A．A
B．B
C．C
D．D