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

Cement was seldom used in buildings of the Middle Ages.()

A. slightly
B. rarely
C. originally
D. occasionally

单项选择题

He made an immense amount of money in business().

A. large
B. small
C. limited
D. little

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