What are smart windows, according to Paragraph 4 ?A.Windows that are coated.B.Windows that are glazed.C.Windows the color of which can be changed.D.Windows that have many layers.

题目

What are smart windows, according to Paragraph 4 ?

A.Windows that are coated.

B.Windows that are glazed.

C.Windows the color of which can be changed.

D.Windows that have many layers.

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