单项选择题

The overall effect of this passage is likely to make the reader feel （）

A．enthusiastic about biotechnology
B．very wary about genetic engineering
C．reluctant to try new plant combinations
D．alarmed about limitless experiments

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热门试题

单项选择题

According to this passage ,the new generic revolution involves （）

A．experiments on plants in the fields
B．developing strains of hybrid corn
C．breeding plants in test tubes
D．rearranging plant genes in laboratories

单项选择题

From the passage we understand that conventional plant breeding produced（）

A．a potato-tomato hybrid
B．new plant technology
C．self-fertilizing plants
D．less dramatic results than the new technology