15．At the start of                 country，cars became popular．（　�。�
A．twentyB．twentiesC．twentiethD．the twentieth

分析 在二十世紀(jì)開始時，汽車變得受歡迎了．

解答 答案：D．
根據(jù)At the start of                 country，可知句子表示在哪個世紀(jì)，一般用序數(shù)詞+country構(gòu)成，序數(shù)詞前面一般加定冠詞the．故選D．

點評 本題考查序數(shù)詞．熟練掌握基數(shù)詞與序數(shù)詞的區(qū)別是做題的關(guān)鍵．

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