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科学、技术与社会的学科变化经历了哪几个阶段？

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Do you know the reason ____ he was late？

A. for which
B. for what
C. which
D. of which

名词解释：城邦民主制

The day ____ （在那天我第一次遇见他）was the first of May on the Great Wall.

Washer is a machine ____ （用它我们洗衣服）or a person who is washing.