单项选择题

It is hard to tell whether we are going to have a boom in the economy or a ______.

A．concession
B．recession
C．submission
D．transmission
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单项选择题
Victoria ______ over a great variety of peoples and lands.
A．prevailed
B．governed
C．dominated
D．reigned
单项选择题
Trees ______ themselves by seeds.
A．cultivate
B．grow
C．enrich
D．propagate
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