单项选择题

A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic condition 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．There are too many courses offered to students.B．The woman should take fewer courses next term.C．The man will take four courses next semester.D．It is wiser to take more than four courses.
A．There are too many courses offered to students.
B．The woman should take fewer courses next term.
C．The man will take four courses next semester.
D．It is wiser to take more than four courses.
单项选择题
A．It has been increasing since the Ice Age.B．It affected the growth of trees.C．It is determinated by the chemicals in the air.D．It follows a certain cycle.
A．It has been increasing since the Ice Age.
B．It affected the growth of trees.
C．It is determinated by the chemicals in the air.
D．It follows a certain cycle.
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