单项选择题

The market for non-food GE products could exceed the market for GE food products by a wide()within the next few years.

A. variety
B. margin
C. range
D. spectrum

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单项选择题
All sorts of technology have () to make the new medical systems applied in rural areas efficient and effective.

A. come into play
B. come into conflict
C. taken action
D. taken place
单项选择题
Newspapers and magazines carry extensive () of diet and health topics and diet books are among the best sellers.

A. sketch
B. concern
C. coverage
D. involvement
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