单项选择题

What is the main purpose of the first green revolution in America

A．To crossbreed the related plants.
B．To add the desirable traits to the plants.
C．To realize the green revolution in three decades.
D．To make the high-yield crops thrive.
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单项选择题
The example of the soybean the author takes is to prove that ______.
A．Americans are fond of soybeans
B．Every mouthful of soybean has been changed by genetic engineering
C．America is on the verge of a second green revolution
D．Soybean is treated as an additive to scores of foods
单项选择题
What's the main idea of the last paragraph
A．Crops begin infiltrating our food supply.
B．Maybe the application of biotechnology will cause environmental problems as well as bring effects to human health.
C．The application of biotechnology is also questioned by some other people.
D．The application of biotechnology will bring enormous business to America.
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