单项选择题

You should ask ______ your parent's opinions about this matter.

A．after
B．to
C．with
D．of
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单项选择题
The world yields (line 13) means ______.
A．plants
B．giving up
C．establishment
D．productions
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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