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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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
单项选择题
Slavery was ______ in the U.S. in the 19th century.
A．retailed
B．canceled
C．abolished
D．stroked
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