单项选择题

Which of the following is NOT the difference between Bt cotton and common cotton

A．Bt cotton is stronger than common cotton.
B．Bt cotton yields more than common cotton.
C．Bt cotton needs less pesticides than common cotton.
D．Bt cotton is harm to cotton bollworms.
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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.
单项选择题
It is better for parents ______.
A．to praise and encourage their children more often
B．to be hard on their children
C．to leave their children alone with nothing to do
D．to give their children as much help as possible
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