单项选择题

The word "this" in the second sentence of paragraph three refers to ______.

A．the way of processing foods
B．producing domestic animals in large quantities
C．the process of enriching the soil
D．raising animals in a natural way
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单项选择题
According to the passage, the writer of this article seems to be ______.
A．interested in sweetened food
B．concerned with diseases caused by natural foods
C．concerned about modern food
D．in favor of mass production of food
单项选择题
According to the passage, people have now come to realize ______.
A．the benefit of using chemicals in producing food
B．the importance of having a healthy diet
C．that food should not be preserved
D．that food has to be chemically processed
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