单项选择题

A．Improved living conditions
B．New ways to help people get over diseases.
C．Many inventions in industry.
D．Industrialization in developing countries.
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单项选择题
A．Material fife.B．Sports fife.C．Spiritual life.D．Working life.
A．Material fife.
B．Sports fife.
C．Spiritual life.
D．Working life.
单项选择题
A．Movies with sound.B．Nylon.C．The radio.D．The computer.
A．Movies with sound.
B．Nylon.
C．The radio.
D．The computer.
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