单项选择题

The author cited the case of the pollen-sprayed milkweed leaves in Paragraph 3 to show______.

A．GM foods may harm crops
B．GM foods contain more protein
C．GM foods can kill insects effectively
D．GM foods also have a dark side
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单项选择题
What happens to those insects when not killed by the spray of insecticide
A．They may lose their ability to produce offspring.
B．They may have a higher ability to adapt to the environment.
C．They move to other fields free from insecticide.
D．They never eat again those plants containing insecticide.
单项选择题
The primary purpose of the passage is to __________.
A．argue that a discarded theory deserves new attention
B．present evidence that resolves a contradiction
C．introduce a recently discovered source of information
D．challenge a widely accepted explanation
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