单项选择题

According to the passage, which of the following is the right answer of the cause of dropping temperatures

A．Man's pollution of the atmosphere
B．Volcanic eruptions
C．Air pollution
D．All of the above
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单项选择题
Which of the following was the cause of cold weather in England from 1815 to 1818
A．England's proximity to the North Sea.
B．Volcanic ash in the atmosphere.
C．Floodings in the area.
D．Pollution caused by the International Revolution.
单项选择题
According to the passage, which of the following is NOT the cause of dropping temperatures
A．Volcanic eruptions.
B．Mountain torrents.
C．Crop and livestock production.
D．The floods after the storm.
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