单项选择题

Economics and politics are best studied together as the two subjects ______.

A．overlap
B．slash
C．flap
D．slap
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单项选择题
The little girl was so shy that she ______ every time she was spoken to.
A．flashed
B．blushed
C．blundered
D．blossomed
单项选择题
The dying man ______ with agony as the rescuers tried to move him.
A．greased'
B．grieved
C．groaned
D．grinned
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