单项选择题


A．environment
B．space
C．atmosphere
D．earth
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单项选择题
A．shownB．exposedC．facedD．covered
A．shown
B．exposed
C．faced
D．covered
单项选择题
A．put up withB．keep up withC．come up withD．catch up with
A．put up with
B．keep up with
C．come up with
D．catch up with
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