单项选择题

The disadvantage of the patchwork of US regulatory agencies that govern agricultural biotech is that ______.

A．none of these agencies is responsible for wild plants
B．one thing is omitted from the patchwork: human tolerance for pesticides
C．there is bureaucratic cracks and the public interest is ignored
D．pesticides are exempt from FDA' s reach
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单项选择题
Which of the following statements is true of superweeds
A．Superweeds could eradicate food crops.
B．Crops genetically engineered to resist pesticides could make superweeds grow high.
C．Superweeds could hinder food crops' growth.
D．Superweeds could grow between cracks.
单项选择题
The author thinks that the biologists who engineer genes into plants ______ .
A．are nothing more than any other substances because they are made of molecule too
B．pay special attention to living things and their relation to their environment
C．insert the genes of one species among the genes of another and test the environment consequences
D．modify the genes of our food crops without considering the influence on the whole organism
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