单项选择题

What is the main topic of this passage（）

A．Bacteria bioengineering.
B．Genetic engineering.
C．Agricultural technology.
D．Virus biotechnology.

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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

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