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By saying "they employ chemical warfare" （Line 4, Para. 2), Bruce Ames means______.A．plant

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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A．were used to saying

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