1、Period ThreeUnit 7 The Sea Period Three Lesson 27 The Sea World 课件（北师大版必修 3）Language Focus1Its three times as big underwater.水下部分是水上部分的三倍。归纳拓展常用的倍数表达法：(1)“A倍数形容词或副词的比较级thanB”，表示“A 比 B 大(长、高、宽等)多少倍”。(2)“A倍数as形容词或副词的原级asB”，表示“A 是 B 的多少倍”。(3)“A倍数the size/height/length/width，etc.ofB”，表示“A 是 B 的多少倍”。(4)A
2、倍数what 从句。Period Three语境助记(1)There are five times more books in our library than in yours.我们图书馆里的书比你们图书馆里的书多五倍。(2)He has read twice as many books as I have.他读的书是我读过的两倍。(3)My house is twice the size of my parents.我的房子是我父母的两倍大。Period Three题组训练(1)句型转换The rope is 3 times as long as that one.The rope is
3、3 times _ _ _ that one.The rope is _ _ _ that one.(2)语法填空According to statistics，a man is more than twice as likely to die of skin cancer _ a woman.thelengthoftwicelongerthanasPeriod Three2There are fantastic shows every two hours.每两小时有一场精彩的表演。归纳拓展every 基数词复数名词，意为“每”。every 序数词单数名词，意为“每第”。every other
4、 单数名词，意为“每隔一”。every few 复数名词，意为“每隔几”。注意 every 后跟表示距离的词，译成汉语“每”或“每隔”时，数词与英语中保持一致。Period Three语境助记(1)Please come to see me every other day/every two days.请每隔一天来看我一次。(2)Please write in every other line.请隔行写。Period Three题组训练(1)You will be better soon if you take the medicine _(每四小时一次)(2)These plants are
5、 watered _(每隔一天)(3)How often does he make a trip here?_(每五天)once every four hoursevery other dayEvery five daysPeriod Three3Watch out！当心！(注意！小心！)归纳拓展watch out for 当心，提防；注意(后需跟宾语)watch over 照看，看守；保护Watch it！(口语)小心！当心！be on watch 值班；监督keep a watch on 监视Period Three语境助记(1)Watch out！Theres a car coming.
6、小心！有辆车过来了。(2)Watch out for the tall man in a black hat.注意那个戴黑帽子的高个子男人。(3)The staff were asked to watch out for forged bank notes.已经要求职员留意假钞。Period Three题组训练(1)The mother bird is _(照看)her young.(2)He slipped out when nobody was _(监视)(3)While walking in the street，you should _ _(当心汽车)watching overon w
7、atchwatch out forthe carsPeriod Three4 “Ontheonehand，we loved most of the attractions，.On the other hand，I didnt think that the caf was as good as it should be.”“一方面我们喜欢大部分有吸引力的东西另一方面，我认为这个餐馆不如想像的那么好。”归纳拓展on the one hand.on the other hand.一方面另一方面(引出不同的，尤其是对立的观点、思想等)for one thing.for another(thing).一
8、则，再则(用来进一步解释，提出另外的理由)Period Three语境助记(1)On the one hand I want to sell the house，but on the other hand I cant bear the thought of moving.一方面我想把房子卖掉，但另一方面我又不愿搬家。(2)On the one hand，I have no time；on the other hand，I have no money.So I cant go abroad to visit you.一方面我没有时间；另一方面我没钱。因此我不能去国外看你。Period Thre
9、e题组训练(1)_ the color of the coat doesnt suit you；for another(thing)its too expensive.一方面这件外套的颜色不适合你，另一方面它太贵了。(2)I would like to find a job which pays more，but _ _ I enjoy the work Im doing at the moment.我想找一份薪水高的工作，但另一方面我又喜欢现在的这份工作。For one thingon theother handPeriod Three5Special discount before the
10、 22nd so the sooner the better!22 日前特价，越早(订票)越好！归纳拓展discount n折扣，减价；v.打折扣；不重视at a discount 打折discount price 折扣价注意 discount 指某物减价出售时所减去的百分比。中文“折扣”意为扣除所减之百分比后余下的百分比。换句话说，中文说九折，英文是 10%discount。Period Three语境助记(1)The store discounted all clothing for the sale.该店服装全部减价出售。(2)His information is not to be d
11、iscounted.他的信息不可不重视。(3)We give a 10%discount for cash.现金付款，我们给予九折优惠。Period Three题组训练(1)You can _(打 8 折)if you buy more than three at a time.(2)The bookstore _ (所有书籍都打折以促销)(3)Wow，so cheap are the goods!Yes，all of them are _.哇！这些物品真便宜！是的，它们都在打折销售。get a 20%discountdiscounted all the books to promote sa
12、lesat a discountPeriod Three6Bigger dolphins can measure four metres in length.更大的海豚长达四米归纳拓展measure n尺寸；措施；程度；vi.&vt.测量，衡量；估量；(长度；数量)为take sb.s measure/take the measure of sb.给某人量尺寸a measure of.测试(判断)的方法take measures/steps/action to do sth.采取措施做某事make.to ones measure 依照某人的尺寸做Period Three语境助记(1)The n
13、urse weighed me and measured my height.护士称了一下我的体重，然后量了一下我的身高。(2)You cant measure someone by the clothes they wear.你不能以衣着衡量一个人。Period Three题组训练(1)You should _ your working conditions.你们应采取有效措施来改善你们的工作条件。(2)In the old days，my mother always made new clothes _(按我的尺寸)with Spring Festival coming.take effective measures to improveto my own measurePeriod ThreeThey are less colourful than some other fish but they move beautifully.句式分析：这是一个_句，由连接词_连接，表示_。自主翻译：_并列but转折与其他一些鱼相比，它们不算绚丽多彩，但游姿优美。
