单项选择题

A．Central Africa.
B．South Asia.
C．North America.
D．South America.
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单项选择题
In the United States, the only pollutant for which there is a national air quality standard is lead.
A．Y
B．N
C．NG
单项选择题
A．Boots.B．Sneakers.C．Slippers.D．Leather shoes.
A．Boots.
B．Sneakers.
C．Slippers.
D．Leather shoes.
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