单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．An alien spacecraft landing.
B．The impact of a meteorite.
C．A volcanic eruption.
D．The blizzard conditions in Alaska.

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单项选择题

Which statement is TRUE about population increase

A．There might be an increase of 2.2 billion persons from 1975 to the year 2000.
B．About 50,000 babies are born annually at present.
C．Between 8000 B.C. and the present, the population increase is about 80,000,000 persons each year.
D．The population increased faster between 8000 B.C. and 1650 than between 1650 and the present.

单项选择题

What is not said to be a way of cleaning up after ourselves

A．Throw less away.
B．Don’t use it again.
C．Design recycled products.
D．Last longer.

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