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
A security officer at the factory, who ______ to give his name, said he had seen two men leave the building.
A．descended
B．decreased
C．denounced
D．declined
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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