单项选择题

A．Because we have many specialists who can do most of the jobs.
B．Because we have more and more working people.
C．Because we have computers and such things to help us.
D．Because our society is divided into sub-groups.
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单项选择题
A．He succeeded in beating a mugger in a fight.B．He became a karate(空手道)expert.C．He passed away in a hospital after a fight with a mugger.D．He called the police after being mugged.
A．He succeeded in beating a mugger in a fight.
B．He became a karate(空手道)expert.
C．He passed away in a hospital after a fight with a mugger.
D．He called the police after being mugged.
填空题
When ______, the problem of unemployment will arise.
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