单项选择题

A．They will be much bigger.
B．They will have more seats.
C．They will have three wheels.
D．They will need intelligent drivers.
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单项选择题
A．About 45 million.B．About 50 million.C．About 5.4 million.D．About 4.5 million.
A．About 45 million.
B．About 50 million.
C．About 5.4 million.
D．About 4.5 million.
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