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【单选题】

Plateau's experiments were the first steps leading to the invention of ______.

A．eyeglasses

B．telescopes
C．bifocals
D．motion pictures
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根据网考网移动考试中心的统计，该试题：

21%的考友选择了A选项

6%的考友选择了B选项

12%的考友选择了C选项

61%的考友选择了D选项

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