单项选择题

A．Because it was so cheap.
B．Because the quality was too high.
C．Because people thought it was less realistic than black and white.
D．Because people thought it was too realistic.
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单项选择题
A．In Boston.B．In America.C．In the Peak District.D．In a big world.
A．In Boston.
B．In America.
C．In the Peak District.
D．In a big world.
单项选择题
A．Use of copper conductors.B．Use of plastic insulator (绝缘体).C．Use of silicon (硅) semiconductors.D．Elimination of chemicals.
A．Use of copper conductors.
B．Use of plastic insulator (绝缘体).
C．Use of silicon (硅) semiconductors.
D．Elimination of chemicals.
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