单项选择题

A．France.
B．Canada.
C．America.
D．England.
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单项选择题
A．An MP3.B．A CD player.C．A Walkman.D．He does not give a definite answer.
A．An MP3.
B．A CD player.
C．A Walkman.
D．He does not give a definite answer.
单项选择题
A．Urban residents produce more and more waste water.B．Seas and rivers provide less and less drinking water.C．Industries need large quantifies of water.D．Agriculture produces large amount of harmful chemicals.
A．Urban residents produce more and more waste water.
B．Seas and rivers provide less and less drinking water.
C．Industries need large quantifies of water.
D．Agriculture produces large amount of harmful chemicals.
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