单项选择题

What will be one effect of the new biotechnology on plants（）

A．They will grow anywhere in the world.
B．Some will be able to grow in salty soils.
C．They will become poisonous to pests.
D．Using nitrogen from the air they will be able to cross-fertiliz

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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.

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