◎ 题干
—Why didn't you buy a ticket for your son?
—They allow a(n)_____to take a child under 1.2 m onto the train for free.  
[     ]
A. kid    
B. teenager    
C. expert    
D. adult
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Why didn't you buy a ticket for your son?—They allow a(n)_____to take a child under 1.2 m onto the train for free. [ ]A. kid B. teenagerC. expert D. adu…”主要考查了你对  【名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。