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. TEXT C
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单项选择题
According to the passage, the effects of Tambora's eruption were______
A．of several days' duration worldwide
B．felt mainly in the Dutch East Indies
C．evident in the decreased world temperature
D．immediately evident to the world's scientists
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 modern times
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