单项选择题
If there were no greenhouse effect, ______.
A．no plants would grow on our planet
B．earth would be thirty degrees colder
C．man could not live on the earth
D．all of the above answers are correct
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单项选择题
Suppose the earth's temperature rose by 3 degrees, ______.
A．great harm would be done to mankind
B．the sea level would go by 10 centimetres
C．all the land in the world would be flooded
D．crops would be unable to grow on the earth
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单项选择题
Which of the following is NOT true
A．Burning too much coal and oil produces lots of greenhouse gases.
B．It has become warmer on the earth now than in the past.
C．Gases put into the atmosphere now will affect the earth years later.
D．The temperature in a greenhouse is as high as that in the atmosphere.
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