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
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
Why is the problem of drinking and driving difficult to solve
A．An alcohol is easily obtained.
B．Drinking is linked to organized crime
C．Legal prohibition has already failed
D．Legislation alone is not sufficient
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