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
It isestimated that a scientific principle has a life expectancy of approximately a decade before it drastically revised or replaced by newer information（）

A.estimated
B.a life expectancy
C.decade
D.it drastically
单项选择题
In the north of the country,the sun always shines（）the vast prairie land in summer

A.brightly on
B.bright on
C.bright in
D.brightly in
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