单项选择题

Which of the following best describes the passage as a whole

A．An outline for future research.
B．An analysis of a dispute between two theorists.
C．A discussion of research findings in an ongoing inquiry.
D．An expanded definition of commonly misunderstood terms.
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单项选择题
That genetically-modified crops could have harmful effects that can be deduced from the fact that ______.
A．cross-breeding is a natural process
B．hybrids are generally more successful at breeding than natural plants
C．gene movement between cultivated plants and wild ones is inevitable
D．new research shows that genetically-modified plants are likely to develop into weeds
单项选择题
The author suggests that the main impact that gene transfer between crops and weeds could have is ______.
A．the collapse of the agricultural industry
B．the rapid development of unintended plant hybrids
C．the development of pest and herbicide-resistant weeds
D．the difficulty to determine whether to make crops resistant to pests or not given the limited nature of current research
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