单项选择题

Racing the clock every day is such an exhausting effort that when I actually have a few free moments, I tend to (collapse).

A．fall down
B．fall ill
C．fall out
D．fall behind
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单项选择题
The book shifted her (outlook) from social to spiritual, for its theme was that before you change other people you have to change yourself.
A．viewpoint
B．vocation
C．prospect
D．preference
单项选择题
Safety officials have (earnestly) questioned whether the increased use of synthetic materials heightens the risk of fire.
A．cautiously
B．severely
C．accurately
D．seriously
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