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
Laws recently introduced in some states have ______.
A．Reduced the number of convictions
B．Resulted in fewer serious accidents
C．Prevented bars from serving drunken customers
D．Specified the amount drivers can drink
单项选择题
Statistics issued in New Jersey suggested that ______.
A．Many drivers were not of legal age
B．Young drivers were often bad drivers
C．The level of drinking increased in the 1960s
D．The legal drinking age should be raised
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