173. What is a unique feature of the library's exterior?
(A) It is made entirely of recycled plastic.
(B) It generates electricity through solar panels.
(C) It changes color based on the temperature.
(D) It has a retractable roof.

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統計： A(20), B(347), C(8), D(22), E(0) #3804531

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解題詳解 一、本題核心觀念 本題屬於**...
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