单项选择题

What will be the possible threat to plants in the future

A．Storms and floods.
B．Disease and fire.
C．Less space for their growth.
D．Rapid increase of the animal population.
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单项选择题
What has happened since the and of the Ice Age
A．Many species have moved further north.
B．Many new species have come into existence.
C．Many species have developed a habit of migration.
D．Many species have become less sensitive to climate.
单项选择题
Why were the two large jets specially mentioned
A．To show the key role played by the air traffic controller.
B．To show the great responsibility of the pilots.
C．To give an example of air disasters.
D．To show that air travel is far safer than driving a car.
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