21. What does paragraph 1 mainly discuss?
(A) Design elements in the Art Nouveau style
(B) The popularity of the Art Nouveau style
(C) Production techniques for art glass
(D) Color combinations typical of the Art
Nouveau style
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統計: A(1), B(3), C(0), D(0), E(0) #802243
統計: A(1), B(3), C(0), D(0), E(0) #802243