单项选择题

A．It is very commercial.
B．It is very noisy.
C．It is very insecure.
D．It is very unfriendly.
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单项选择题
A．Improved living conditionsB．New ways to help people get over diseases.C．Many inventions in industry.D．Industrialization in developing countries.
A．Improved living conditions
B．New ways to help people get over diseases.
C．Many inventions in industry.
D．Industrialization in developing countries.
填空题
3().
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