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
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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
单项选择题
All the references she has obtained for her doctoral dissertation ______ about twenty items.
A．make up for
B．add up to
C．come up with
D．put up with
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