单项选择题

What is the writer's attitude to GM foods

A．We cannot tell from the passage.
B．He thinks their benefits outweigh their risks.
C．He thinks their risks outweigh their benefits.
D．He thinks their benefits and risks are balanced.

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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

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.