单项选择题

A．The quality of air.
B．The number of trees.
C．The lifecycle of trees.
D．The intensity of solar burning.
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单项选择题
A．In a house.B．In a hotel.C．In a two-bedroom apartment.D．In a three-bedroom apartment.
A．In a house.
B．In a hotel.
C．In a two-bedroom apartment.
D．In a three-bedroom apartment.
单项选择题
A．Because they have a driving license.B．Because they have received special training.C．Because the traffic conditions in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
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