单项选择题

Mr Chen complained about the ______ air-conditioner he bought from the company.

A．inefficient
B．defective
C．ineffective
D．deficient
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单项选择题
Diamonds are usually cut to bring out their natural luster and to remove any flaws.
A．germs
B．shortcomings
C．flakes
D．defects
单项选择题
The English vocabulary is known for a (an) ______ of words which are comparatively seldom used in ordinary conversations.
A．multitude
B．altitude
C．latitude
D．platitude
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