单项选择题

A．At a shopping center.
B．At an electronics company.
C．At an international trade fair.
D．At a DVD counter in a music store.
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单项选择题
Smog is caused by chemical reactions between pollutants derived from different sources, primarily automobile exhaust and industrial emissions.
A．Y
B．N
C．NG
单项选择题
A．He’’s unwilling to fetch the laundry.B．He has already picked up the laundry.C．He will go before the laundry is closed.D．He thinks his mother should get the clothes back.
A．He’’s unwilling to fetch the laundry.
B．He has already picked up the laundry.
C．He will go before the laundry is closed.
D．He thinks his mother should get the clothes back.
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