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.
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单项选择题
A．apple.B．peach.C．grape.D．orange.
A．apple.
B．peach.
C．grape.
D．orange.
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A．To find out the origin of carbon- 14 on Earth.B．To analyze the composition of different trees.C．To look into the pattern of solar wind activity.D．To examine the chemical elements in the Ice Age.
A．To find out the origin of carbon- 14 on Earth.
B．To analyze the composition of different trees.
C．To look into the pattern of solar wind activity.
D．To examine the chemical elements in the Ice Age.
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