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
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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