单项选择题


A．remain
B．increase
C．decrease
D．vary
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单项选择题
A．sinceB．ifC．asD．while
A．since
B．if
C．as
D．while
单项选择题
In this poor country, survival is still the leading industry; all else is _______.
A．luxury
B．accommodation
C．entertainment
D．refreshment
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