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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单项选择题

Vaccines for viral diseases are often produced from ______.

A．plant cells
B．human hormones
C．crop plants
D．bacteria

单项选择题

All of the following aspects of backpacking are discussed in the passage except ______.

A．wearing several layers of clothing
B．getting maximum use from your pack material
C．improving the warmth of your sleep
D．forecasting the weather