Hi.What are you doing？ I am reading a book o______ populatio

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Hi.What are you doing？
I am reading a book o______ population
根据首字母补全对话
此问题怎么做

解题思路：首先根据所给信息猜测句意，然后运用适当形式解答
解题过程：
on
句意：我正在读一本关于人口的书。
on/about 辨析：两者都可表示“关于”，区别是：about 指泛泛地或非正式地谈论某事，其谈论的内容也较为普通；而 on 则指比较有系统地或理论性较强地论述某事，其论述的内容较正式或较严肃。比较：He wrote on mathematics. 他撰写数学著作。He wrote about the school. 他报道有关这所学校的情况。It is a book on birds. 那是一本论及鸟类的书。(可能是一本学术著作)It is a book about birds. 那是一本关于鸟类的书。(可能是一本供小孩看的故事书)

补全对话A:What are you doing there?B:I am reading a book.A:You h A:Hi,Li Lei.What are you (1)____________?B:I am reading a le what are you doing?i'm reading a book by Mark Twain.A.writte What are you doing,MeiMei?I am reading a letter ___ my pen p Hi,Joe!What (a )you reading?I'm reading an (i )book.Raelly?W [ -They are reading book.A.what are you doing B.What are you what are you doing i am read a book,it is inter 英语翻译Hi Paul.How are you?What are you doing these days?I am i A:Hi,Lisa.What are you doing hi sam .this is ____.what are you doing?I am talking for you Hi .Tommy .what are you doing over there.I am ----my camera. --Tom,what are you doing?--I am ( )a cake.