单项选择题

A．Education.
B．Administration,
C．Public security.
D．Transportation.
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单项选择题
A．Improved living conditions.B．Many inventions in Industry.C．New ways to help people get over diseases.D．Industrialization in developing countries.
A．Improved living conditions.
B．Many inventions in Industry.
C．New ways to help people get over diseases.
D．Industrialization in developing countries.
单项选择题
A．Chewing gums.B．Magazines.C．Earphones.D．Scat belts.
A．Chewing gums.
B．Magazines.
C．Earphones.
D．Scat belts.
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