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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单项选择题
No one realized the cause of the deterioration of the world agricultural commodity market because ______.
A．there was a long interval between cause and effect
B．the weather was difficult for us to forecast
C．weather forecasts were inaccurate
D．ecologists didn't exist until modem times
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．Floorings in the area
D．Pollution caused by the International Revolution
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