单项选择题

Researchers at the University of Illinois determined that the ______ of a father can help improve a child's grades.

A．involvement
B．communication
C．interaction
D．association
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单项选择题
Don't lose heart! You should ______ your courage and overcome the difficulty.
A．hold up
B．set up
C．pull up
D．pluck up
单项选择题
They bought the land with a ______ to build a new office block.
A．purpose
B．view
C．goal
D．reason
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