单项选择题

A．9:25 a.m.
B．9:29 a.m.
C．9:30 a.m.
D．10:00 a.m.
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单项选择题
A．In the restaurant.B．In a hotel.C．In a supermarket.D．In a shopping mall.
A．In the restaurant.
B．In a hotel.
C．In a supermarket.
D．In a shopping mall.
单项选择题
A．It exists close to the surface of the Earth.B．It is a component of smog and a harmful substance.C．It is a kind of yellow gas.D．It is formed through a complex reaction.
A．It exists close to the surface of the Earth.
B．It is a component of smog and a harmful substance.
C．It is a kind of yellow gas.
D．It is formed through a complex reaction.
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