单项选择题

The example of the twins going to a uncertainty and a factory Separately shows （）.

A．the importance of their intelligence
B．the importance of their positions
C．the role of environment on intelligence
D．the part that birth plays

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单项选择题
During the （） test, students must select answers.

A．personal
B．objective
C．spoken
D．written
单项选择题
22（）

A．willing
B．reluctant
C．unwilling
D．probable
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