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.
单项选择题
Which of the following is NOT the exact effect of aerosol layer
A．It may reflect heat coming from the sun.
B．It facilitates the balance of heat on the Earth.
C．It would start another ice age.
D．It accelerates the loss of heat on the surface of the planet.
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