单项选择题

By saying "they employ chemical warfare" (Line 4, Para. 2), Bruce Ames means "______".

A．plants produce certain chemicals to combat pests and diseases
B．plants absorb useful chemicals to promote their growth
C．farmers use man-made chemicals to dissolve the natural chemicals in plants
D．farmers use chemicals to protect plants against pests and diseases
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单项选择题
The reduction of the possible hazards in food ultimately depends on ______.
A．the government
B．the consumer
C．the processor
D．the grower
单项选择题
What does the author think of the Americans' view of their food
A．They overstate the government's interference with the food industry.
B．They are overoptimistic about the safety of their food.
C．They overestimate the hazards of their food.
D．They overlook the risks of the food they eat.
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