单项选择题

The ______ stuck on the outside of the envelope says "By Air".

A．label
B．ticket
C．signal
D．advertisement

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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 cross-fertiliz

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.