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
What does the word deteriorated mean (in the last line of paragraph 2 )
A．Weakened
B．Improved
C．Depreciated
D．Decline
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
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