外研版高中英语必修三《The world of science》SectionB PPT课件，共13页。Vocabulary1. beyondbeyond one's control超出某人的控制，不受某人的控制beyond one's imagination 超乎某人的想象beyond expression 无法表达beyond description 无法形容beyond belief令人难以置信beyond one's power 超出某人的权力范围beyond compare 无与伦比练习：The scenery along the lake is beautiful __________________ (无法形容).2. significantsignificance n. 重要性，意义be of great/much significance 重要的，有重大意义的be of no/little significance 无关紧要的have great/no significance (for. . . ) （对……）很重要/不重要attach (great) significance to. . . （非常）重视……练习：Something _____________ (significance) is happening to the world population — it is aging.3. originthe origin of. . . ……的起源/起因in origin 在来源上have one's origins in. . . 起源于……by origin 籍贯original adj. 原来的，起初的；独创的originally adv. 原来，起初originate vi.起源，发端于；vt. 创立，创建练习：The jeans today have changed very slightly from their __________ (origin) design.4. curea cure for. . . ……的疗法／措施cure sth. 治好……疾病cure sb. 治好某人cure sb. of sth. 使某人从某种疾病中痊愈练习：Medical research often makes use ________ the forests' plant and animal life, and the destruction of such species could prevent researchers from finding cures _______ certain diseases.Grammar现在完成时的被动语态动词的语态表示主语与谓语之间的关系。英语有两种语态：主动语态和被动语态。下面几种情况一般用被动语态：1.不知道或没有必要说明动作的执行者是谁。Such books have been written for children.已经为儿童编写这类书籍了。2.强调动作的承受者，而不强调动作的执行者。All these products have been tested. 这些产品都经过测试了。3.动作的执行者很模糊。The letter has been opened. 这封信被人拆开了。4.有时为了礼貌的需要，避免说出动作的执行者。They have been told many times not to make noises.已经有人多次跟他们说别那么大声了。现在完成时的被动语态的基本构成是：have/has been done。但在不同的句式中，其具体形式也有所不同。1.肯定句形式：主语＋have/has been done (+其他).The bridge over the Yellow River has just been completed.黄河上的这座桥刚刚建成。The plan has been studied by the experts last month.这个计划在上个月已经由专家研究过了。2.否定句形式：主语＋have/has not been done (+其他).They haven't been told the exciting news yet, have they?还没有人告诉他们这个令人激动的消息，是吗？The second-hand car has not been sold. 这辆二手汽车还没有被卖出去。3.一般疑问句形式Have/Has+主语+ been done (+其他)?－Has her work been finished? 她的工作完成了吗？－Yes, it has. 是的，完成了。4.特殊疑问句形式特殊疑问词＋have/has+主语＋been done (+其他)?How long has the machine been used? 这台机器使用多久了？... ... ...关键词：The world of science PPT课件免费下载，.PPTX格式； 本作品中主体文字及图片可替换修改，文字修改可直接点击文本框进行编辑，图片更改可选中图片后单击鼠标右键选择更换图片，也可根据自身需求增加和删除作品中的内容，源文件无水印。如认为该内容涉嫌侵权，可通过邮件提出书面通知，我们将及时处理。