单项选择题

The first permanent picture was made by using_________

A．special paper
B．silver salt
C．common salt
D．a special metal
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单项选择题
Which of the following is true
A．Bicycles have special lanes everywhere.
B．Bicycles and cars are having more accidents.
C．Bike paths are convenient for bicyclists.
D．Bicyclists are fined ＄ 25 for every violation.
单项选择题
What is the latest problem facing people who drive to school
A．Pollution in the air.
B．A lack of parking.
C．Accidents with bicycles.
D．A lack of bridges.
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