单项选择题

Maximum benefits range from $ 50,000 to $ 250,000 ,though some ______ have no limit.

A．policies
B．bills
C．charges
D．prices

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单项选择题

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

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

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