单项选择题

A．In the restaurant.
B．In a hotel.
C．In a supermarket.
D．In a shopping mall.
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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.
填空题
The country that brings about the largest amount of global warming pollution is______.
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