单项选择题

The substance can be added to gasoline to accelerate the speed of automobiles.()

A. quicken
B. shorten
C. loosen
D. enlarge

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单项选择题
We resolved the problem after group discussion.()

A. caused
B. met
C. solved
D. posed
单项选择题
There is an abundant supply of cheap labor in this country.()

A. steady
B. plentiful
C. extra
D. stable
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