单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．The CPU is broken.
B．The screen is flashing.
C．It doesn’t work.
D．It dropped to the floor.
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单项选择题
What’s the result of an accumulation of ice
A．An accumulation of ice would make the global climate system altered.
B．An accumulation of ice would make snow more difficult to melt.
C．An accumulation of ice would increase the amount of moisture in the air.
D．An accumulation of ice would increase the global temperature.
单项选择题
What can be inferred from the passage
A．The climate of earth has fluctuated quite a bit over the last 4.6 billion years.
B．An increase in the earth’s temperature will have major consequences for all life on this planet.
C．The information we have got makes us unable to explain the global warming completely.
D．The Pleistocene began about 1.8 million years ago.
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