单项选择题

London taxi drivers arc very efficient ______

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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热门试题

单项选择题The training period lasts _______

A．two to four months
B．about three weeks
C．at least half a year
D．two years or more

单项选择题______ of the population is illiterate.

A．50%
B．2%
C．4%
D．6%