单项选择题

Questions 11 to 20 are based on the conversation you have just heard.

A．In a hospital.
B．At school.
C．In the pharmacy.
D．At a filling station.
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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
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.
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