单项选择题

It is always useful to have savings to ______.

A．come but in
B．bye up to
C．make a fuss of
D．fall back on
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单项选择题
The first two assumptions made about the ______ of TV were dead wrong: that it would bury radio and it would be a threat to movies.
A．recession
B．advent
C．diversity
D．bias
单项选择题
A 50-ft.wave travels at speeds ______ 20 m.p.h., and anyone who's too slow at the approach risks being smashed.
A．in excess of
B．in the reach of
C．in exchange for
D．in relation to
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