单项选择题

A．out
B．off
C．on
D．over
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单项选择题
A．countedB．estimatedC．expectedD．accumulated
A．counted
B．estimated
C．expected
D．accumulated
单项选择题
A．Families with cars.B．American’s heavy dependence on cars.C．Roads and highways.D．Traffic problems in America.
A．Families with cars.
B．American’s heavy dependence on cars.
C．Roads and highways.
D．Traffic problems in America.
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