单项选择题

When carbon is added to iron in proper（）, the result is steel.

A. rates
B. thicknesses
C. proportions
D. densities

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Mr. Smith says: The media are very good at sensing a mood and then ______ it.
A. overtaking
B. enlarging
C. widening
D. exaggerating
单项选择题
The most basic reason why dialects should be preserved is that language helps to （）a culture.

A. retain
B. relate
C. remark
D. review
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