单项选择题

Academic records cannot be duplicated.

A. borrowed
B. purchased
C. copied
D. rewritten
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单项选择题
There is always excitement at the olympic Games when an athlete breaks a record.
A. beats
B. maintains
C. matches
D. tries
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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