According to the professor, why are arches that are built today mostly decorative in function? A.Wedge-shaped blocks have become rarE. B.Decorative arches provide work for bricklayers. C.Few architects like ancient construction techniques. D.Wide openings are now spanned with steel beams.
A.Wedge-shaped B. B.Decorative C. C.Few D. D.Wide E.
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D 解析：The professor says ...behind all that beautiful bri......