步步高配套课件 选修8 Unit 5 Meeting your ancestors

It is generally assumed that stress is caused by too much work. 普遍认为，紧张是工作过重所致。 The court assumed responsibility for the girl’s welfare.
归纳总结 assume v.假定，假设，设想；承担 。 (1)assume sb./sth.to be假定/假设某人/某事 为…… It is assumed that...……被认为 (2)assumption n.假定，假设 make an assumption认为，假定 on the assumption that假定 (3)assuming that...假设/假定……
即学即用 （1） Assuming that he’s still alive (假定
他还活着)，how old would he be now? （2） Let us assume (我们假定) for a moment
that the plan succeeds. （3）His actions were based on a false
Ⅲ.典型句式运用
1.We have been excavating layers of ash almost six metres thick,which suggests that they might have kept the fire burning all winter.我们一直在挖掘一层层的 积灰，几乎有六米厚。这意味着他们可能整个 冬天都在烧火。 考点提炼 （1）句中suggest的含义是“暗示； 意味；表明 ”。
易混辨异 alternative,choice,selection (1)alternative一般强调在只有两种可能性或者行为 方式之间进行的选择。 An unhappy alternative is before you.Your mother will never see you again if you do not marry Mr.Collins,and I will never see you again if you do. 摆在你面前的是个很不幸的难题，你得自己去选择。 如果你不嫁给柯林斯先生，你母亲就再也不想见你， 而如果你要嫁给他，我就再也不愿见到你。
即学即用 （1）电话铃声打断了他的谈话。
He was interrupted by the ringing of the telephone. （2）如果你起得早，尽量不要打扰别人。
If you get up early,try not to disturb everyone else.
4.arrest
he does. 7.It is generally assumed that stress is
caused by too much work. 8.The house was always messy . 9.She took a mouthful of food and then
suddenly spat it out. 10.A hedge forms the division between their
归纳总结 alternative adj. 供选择的；其他的； n. 可能 的选择；选择对象。 alternative energy可替代能源 an alternative to...……的替代品 have no alternative but to do sth.别无选择 只好做…… There is no alternative...别无选择
land and ours.
Ⅱ.重点词语再现
1.look ahead 向前看；为将来打算 2. date back 追溯到…… 3. fed up with 受够了；厌烦；饱受 4. cut up 切碎 5. at most至多 6. regardless of 不管，不顾 7. arrest sb.for...因……而逮捕某人 8.with relief欣慰地 9. be proud of以……为骄傲 10.turn to sb.for help 向某人求助
4.That (The fire) would have kept 饭，还可 以用火来吓跑野兽。them warm, cooked the food and scared wild beasts away as well. 他们用火来取暖、做饭,还可以用火来吓跑野兽。 考点提炼 would表示猜测，意为：“想必……, 肯定会…… ”，用于虚拟语气。 would,used to都表示过去习惯性的动作。 would不涉及与现在情况的对比，常带有浓厚的 感情色彩。 used to表示过去习惯性的动作或状态，但这种 习惯现在已不存在了。
(2)choice泛指从一组人或物中进行的自由选择， 指“选择，挑选，抉择”。 The store offers a wide choice of fruit and vegetables. 商店提供许多可供选择的水果和蔬菜。 (3)selection含有从许多可供选择的人或物中择 优选拔的意思。 Parents should be careful in their selection of the movies their young children see. 家长们在为孩子们挑选电影时应小心谨慎。
归纳总结 Interrupt vt. & vi. 打断，中断；打扰。 interrupt sb.打断某人讲话或正在做的事 interruption n.中断，打断 without interruption不间断地 cut/break into...打断，插话 put in...插嘴说（后接插入说的内容）
3.She had almost reached her destination when a delicious smell arrested her progress and she stopped.快到达目的地的时 候，一阵香气扑鼻，她不往前走了，停了下来。 考点提炼 句中“had done...when...”是一 个常用句型，意为“（刚）做完了……就在那 时…… ”。 when表示“就在那时”意义时，常见句式及意 义如下：
Unit 5 Meeting your ancestors
基础落实
Ⅰ.高频单词思忆
1.The discovery of oil is of great significance(意义) to the country’s economy.
2. Somehow (不知怎么地)the thieves had managed to get in through a tiny bathroom window.
3.interrupt
I’m sorry to interrupt you but how could they live here?（回归课本P38） 观察思考 Go on,please.I don’t want to interrupt you. 请继续，我不想打断你的谈话。 World War Ⅱ interrupted many students’ study. 第二次世界大战中断了许多学生的学业。 Please don’t interrupt me while I am writing. 我在写作时请不要打扰我。
（2）“must have+过去分词”用来表示对过去 某种情况的推测，可能性较大，意为“ 一定、 肯定发生了某事 ”，只用于肯定句，在疑问句 或否定句中常用can/could代替。
2.It seems that they used the sharpened stone tools to cut up animals and remove their skin.看起来似乎是他们用尖利的石头工 具来切割动物并剥去它们的皮毛。 考点提炼 It seems (to sb.) that/as if... 意为：（对某人来说）似乎…… ,as if后边可 用 虚拟语气。 seem to be/like+n.... 似乎……，好像…… seem to be doing sth./to have done sth. 好像正在做/已经做了某事 seem (to be)+n./adj.似乎是…… There seems to be...好像有……
易混辨异 assume,guess,imagine (1)assume假设，设想，认为；指很少或完全无根 据的心理推测，并非合乎逻辑的推理，或指为论 证而提出有一定根据的假设。 （2）guess猜测，猜想，最常用词，指毫无根据 仅凭个人主观臆断或碰运气的猜测。 （3）imagine想像，指毫无根据、随意想像，可 在脑海中构成清晰明确的图像。
She had almost reached her destination when a delicious smell arrested her progress and she stopped.(回归课本P43) 观察思考 Embry was arrested for stealing cars. 恩布里因为偷车而被捕了。 He was placed under the house arrest in 1995. 他在1995年被软禁。 The police expected to make an arrest soon. 警方很快就会进行拘捕。
易混辨异 interrupt,disturb （1）interrupt突然中断、打断他人的言语或行 为，使其不能继续。 interrupt sb.打断某人讲话或正在做的事 interruption n.中断，打断 without interruption不间断地 （2）disturb较正式用语，多用被动语态。指扰 乱，使人不能平静或妨碍别人工作、思维或正常 秩序，是程度较深的烦恼。
导练互动
重点单词 1.assume
Hale Waihona Puke So we think it is reasonable to assume they lived in these caves,regardless of the cold.(回归课本P38) 观察思考 I had assumed him to be a Belgian. 我本以为他是比利时人。 Don’t always assume the worst. 别总往最坏处想。