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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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
单项选择题
If parents take an attitude of benign neglect, they ______.
A．left their children to their own devices if they get into trouble
B．jump in to solve all their children' s problems
C．keep a watchful eye on their children but don' t interfere in their affairs only when they are needed
D．are indifferent to their children' s trouble
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