单项选择题

A．Bicycles and cars.
B．Building codes.
C．New housing construction.
D．Energy conservation.
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单项选择题
A．He was very busy.B．He arrived late.C．He was sick.D．He missed the appointment.
A．He was very busy.
B．He arrived late.
C．He was sick.
D．He missed the appointment.
单项选择题
We may safely conclude that ______.
A．the author belongs to the anti-railway group
B．the author belongs to the pro-railway group
C．the author speaks highly of the railway
D．the author may never take train because of its potential dangers
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