单项选择题

The word "boon" at the end of paragraph 1 is closest in meaning to ______.

A．success
B．accomplishment
C．dream
D．benefit
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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
D．less dramatic results than the new technology
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 cress fertilize.
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