单项选择题

The topic with which the article is concerned is （）

A．natural foods
B．eating habits
C．healthy eating
D．food problems

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单项选择题
The use of chemicals and fertilizers in farming is meant to increase（）

A．the quantity of foods
B．the quality of foods
C．either the quantity or the quality of foods
D．the quality as well as the quantity
单项选择题
The phrase live up to (Line 2, Para. 1) in the context means （）

A．meet the standard of
B．realize the purpose of
C．fulfill the demands of
D．keep the promise of
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