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
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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.
单项选择题
Vaccines for viral diseases are often produced from ______.
A．plant cells
B．human hormones
C．crop plants
D．bacteria
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