单项选择题

The course is very popular and the quotas are limited, so it's best to ______ as soon as possible.

A．enroll
B．subscribe
C．absorb
D．register
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单项选择题
The ______ noise of traffic annoyed me and distracted my attention to reading the detective story.
A．permanent
B．provocative
C．perpetual
D．prevalent
单项选择题
This diploma ______ that you have completed high school.
A．certifies
B．clarifies
C．rectifies
D．exemplifies
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