She touched him on his head with a smile and said, "My boy, why not play what you know well?"
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【正确答案】 1、正确答案：代词误用，应把his改为the。    
【答案解析】解析：表示身体部位的名词前通常要加定冠词。例如：I hit him on thechin．／I gave him a pat on the shoulder．