单项选择题

What did Dr. Edwin Land invent

A．A quick process of developing film.
B．A new kind of film.
C．An automatic printer.
D．A kind of camera that develops its own film.
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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
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.
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