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17．Acommercial（商業(yè)的）advertisement is one which someone has paid for to promote a product or service．

分析 商業(yè)廣告是指某人為推銷產(chǎn)品或服務而付費的廣告．

解答 commercial 考查形容詞．根據(jù)句意：商業(yè)廣告是指某人為推銷產(chǎn)品或服務而付費的廣告．此處用形容詞修飾advertisements，commercial是形容詞"商業(yè)的"．

點評 本題考查形容詞的詞義辨析．形容詞詞義辨析題一直都是高考考查的一個熱點，它注重考查考生結合語境準確選用詞語的能力．由于英語詞匯豐富，且用法多變，考生掌握起來有較大難度，因此在平時應注意詞匯的積累，理解詞語的含義及其常見的習慣搭配，再聯(lián)系句子所表述的意義和語境，選出正確的答案．

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