单项选择题

After two years he received the certificate of the college for ______ in chemistry.

A．proficiency
B．diversion
C．immersion
D．involvement
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单项选择题
Slavery was ______ in the U.S. in the 19th century.
A．retailed
B．canceled
C．abolished
D．stroked
单项选择题
Although he failed in the maths test, it was wrong to ______ at his efforts.
A．giggle
B．mock
C．grin
D．sneer
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