单项选择题

A．70.
B．27.
C．17.
D．22.
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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.
A．They will be much bigger.
B．They will have more seats.
C．They will have three wheels.
D．They will need intelligent drivers.
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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