单项选择题

Why scientists say no to GM cotton

A．Because the cotton was genetically modified.
B．Because the cotton was found to damage the environment.
C．Because the cotton harms the bollworm.
D．Because Monsanto dismissed the research.

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热门试题

单项选择题

The author imply that ______.

A．The US's Monsanto agreed with the results of Chinese scientists study
B．GM cotton is an ideal crop
C．The US's Monsanto dismissed the research for its own profit
D．Cotton bollworm has no resistance to Bt cotton over time

单项选择题

In Bt cotton fields, some pests replaced the bollworm as the primary pest because ______.

A．their favorite food is Bt cotton
B．the bollworms were killed out by the Bt cotton
C．both their enemies and the bollworm were all killed by Bt cotton
D．people used the pesticides