单项选择题

Parcels must be left open mainly for________.

A．customs’’ check
B．security check
C．convenience’’s sake
D．the company’’s sake
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单项选择题
________has been the major problem in the Great Lakes in recent years.
A．Too many algae
B．Excessive recreational use
C．Lack of adequate rainfall
D．Too much evaporation
单项选择题
About ________cars and dogs are destroyed each year.
A．6 million
B．15 million
C．30 million
D．1 million
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