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.
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单项选择题
A．A CD player.B．An MP3.C．A Cassette player.D．An MP4.
A．A CD player.
B．An MP3.
C．A Cassette player.
D．An MP4.
单项选择题
A．When they are born.B．When they are ten months old.C．When they are one year old.D．When they are two years old.
A．When they are born.
B．When they are ten months old.
C．When they are one year old.
D．When they are two years old.
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