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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Loud noises can be annoying.
A. hateful
B. painful
C. horrifying
D. irritating
单项选择题
How do you account for your absence from the class this morning()

A. explain
B. expand
C. examine
D. review
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