题目内容
请解释专业名词“信号机内(外)方”的含义
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通读下面的短文，回答题。
提示：爱丽丝的妈妈病了，爱丽丝想向老师格林先生请几天假。
Alice : Excuse me， Mr． Green． I" d like to take a few days off．
Green : 51 ？
Alice:My mother is ill． I have to take care of her．
Green:Oh dear! I am sorry to hear that． 52 ？
Alice:No，thank you． My mother has caught a bad cold． She has a high fever and coughs dayand night． The doctor says my mother has to be in hospital for a few days． I would like tobe with her．
Green : I understand． 53 ？
Alice:I hope to be back next Wednesday．
Green : That" s all right． 54
Alice:Thank you， Mr． Green． That" s very kind of you． I will write it immediately．Green : 55
第51题 ________
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有一个单词的划线部分与其他单词的划线部分的读音不同。找出这个词。
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