Thanks to the vivid ______, the speaker made the abstract concept accessible to all the audience.
A．inflationB．interferenceC．illiteracyD．illustration
D
詞義辨析。inflation 通貨膨脹；interference 干擾，沖突；illiteracy 文盲，無知；illustration說明，圖解。句意：由于這生動的圖解，演講者讓所有觀眾接受了這些抽象的概念。故選D。
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