Lesson 21: Books or Computers?Learning aim:1. Learn about the history of the books.2. Know about the fountain of the printing press.Learning important points:1. Why is the printing press important?2. How did books change information?New words Press appear modern electronic sell Think About ItHow many books have you read this year?Have you ever read an e-book? Do you like them ？Language Points1. In ancient times, there were no books, and people passes on their knowledge by telling stories. 在古代，没有书，人们通过通过讲故事传递知识。by 是介词，后面可以加名词或动名词短语，意为“通过……方式（途径）”。如： I learn English by listening to tapes. 我通过听磁带学英语。 2. It took a long time to write just one book. 仅仅写一本书就要花费很长一段时间。句型 It takes sb. some time to do sth. 意为“某人花费多长时间做某事”， it 是形式主语，真正的主语是动词不定式“ to do sth.” ；take 随时态改变，本句用的是一般过去时态，所以用 took 。如：It took me two hours to clean my house yesterday. 我昨天用了两个小时打扫房子。P2链接：(1) spend…on / in … 意为“花费”，主语是表示人的名词或代词， spend 后接表示金钱或时间的词， on 后接名词， in 后接V-ing 形式，也可省略 in 。如：I spent twenty yuan on the dictionary. 我花二十元钱买的这本字典。They spend one hour doing their homework every day. 他们每天花费一小时做作业。P1P3(2) cost 意为“花费”，主语是表示物的名词或代词，常用于“ sth. cost sb. some money” 。如：The pen cost me ten dollars. 这支钢笔花了我十美元。(3) pay…for… 意为“为……付款”，人作主语，常用 pay some money for sth ， pay 的过去式和过去分词为 paid 。如：My mother paid 30 dollars for her sweater. 妈妈买这件毛衣花了三十美元。ExercisesI. 根据所给汉语提示，完成下列句子。1. A computer is a useful _______ ( 机器 ).2. There are two ________ ( 印刷 ) presses in our sc...
