According to Paragraph 4, smart windows

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问题 According to Paragraph 4, smart windows are the windows that_____.A.are costed.B.are glazed.C.have several layers.D.can change color.

选项 A.are costed.
B.are glazed.
C.have several layers.
D.can change color.

答案 D

解析

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理工B

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