必修三第四单元单词

制作人：

曹倩

审核人

郭光宝

使用时间

2015-3-18 

年级签字

编号

14

课前预习案

熟读本单元单词，找出重点短语

1．及时；终于 ________              2．下蛋 __________
3．产生；分娩 _________             4．轮到某人；接着 _______
5. 阻止；制止 _________              6．挡住(光线) _________
7．感到高兴；感到振奋_______        8．既然 _________
9．突发；爆发 _________             10．密切注视；当心; _________
11．冷却___________                 12．也；还有…… ___________
13．依靠；依赖，取决于_______       14．靠近 _________

课中探究案

一、检查反馈，导入新课。

Check the pronunciation of the new words.

二、目标定位，确定重点。

1. 会读本单元单词，力求读得更流利。

2. 记住本单元的重点单词并能用其造句。

3. 能运用这些词汇解决相关练习题。

三、自主探究，教师点拨。【单词学习】

1．harmful adj. 有害的；伤害的
harm n．&vt. 损伤；伤害    harmless adj. 无害的
be harmful to 对……有害

do sb. harm/do harm to sb. 对某人有害
mean no harm 没有恶意

[即学即练1](1)Fruit juice can ______ __________ ______ children‘s teeth.果汁可能损坏儿童的牙齿。
(2)What he did _________ his reputation.
他所做的损害了他的名声。

(3)He may look fierce, but he _________ ______ ______.
他可能看上去很凶，但并无恶意。

2．exist vi. 存在；生存；维持生活
existent adj. 存在的，现存的　existence n. 存在，生存
There exists/existed....某地有……，存在……
exist in 存在于……之中
exist on 靠……为生
come into existence 开始存在；成立

[即学即练2](1)________ always ________ a force of attraction between two bodies. 两物体间总是存在着吸引力。
(2)They ______ ______ very little food.
他们靠极少的食物来生存。
(3)That word doesn‘t ______ in English.
英语中没有这个词。
5)When did the world ______ ______ ______________？
世界是什么时候开始产生的

3．puzzle vt. 使困惑；使糊涂　n. 难题；谜
puzzling adj. 令人困惑的
puzzled adj. 感到困惑的
puzzle about/over sth. 苦苦思索；仔细琢磨
be in a puzzle about sth. 对某事迷惑不解
be puzzled by 被……迷惑

[即学即练3](1)It's quite ______ ______ ______ us why he did that.
他为何做那样的事，我们完全搞不懂。
(2)This sentence _________ me. 这个句子令我困惑。
(3)I ______ ________ how to solve the problem.
我不知道怎样解决这个问题。
(4)The question is ________ to me. 这个问题令我困惑。

4．in one’s turn轮到某人；接着
in turn依次；轮流；转而；反过来
by turns轮流；交替
take one’s turn轮到某人做……了
take turns依次；轮班，轮流

[即学即练4](1)The girls called out their names ______ ______.
那些女孩儿逐一报出了自己的名字。
(2)We make every effort to make more films, and ______ ______ this creates further environmental pollution.
我们在竭力生产出更多的电影，反过来这又造成了进一步的环境污染。

5．prevent...from 阻止；制止
stop sb. (from) doing sth. 阻止某人做某事
keep sb. from doing sth. 阻止某人做某事
protect sb. (from)...保护某人不受……侵袭，挡住，防御
keep sb. doing sth. 让某人一直做某事

即学即练5](1)What can we do to ___________________ this disease ______ ___________？我们能做什么来防止这种疾病蔓延呢？
(2)Don't ______ others ________ for long.不要让别人等太久。

6．cheer up 感到高兴；感到振奋
cheer sb. up 使某人高兴；使某人振奋
Cheers! 干杯！祝你健康！(用于祝酒)

[即学即练6](1)______ ______！ The news isn't too bad.
振作一点吧！也不是什么太坏的消息。
(2)Every time an English runner won a race, the crowd _________.每次英国选手赢得赛跑冠军，观众就欢呼。

7．break out (战争、灾难、瘟疫等)突发；爆发(无被动语态)
A fire broke out in the neighborhood last night.
昨晚居民区里发生了火灾。

拓展：break away from 脱离(政党等)；打破(陈套等)
break down 出故障，抛锚；(计划等)失败；(身体、精神等)垮掉；打倒，砸破；(化合物等)分解
break in 破门而入；闯入；打断(话语等)
break into  破门而入，突然……起来
break off 折断；突然中止，断绝，结束
break up 打碎，拆散；散开，解散；(学校)期末放假，(集会)结束

[即学即练7]　介、副词填空
(1)She started to speak, then broke ______ while a waitress served us with coffee.
(2)He lost his job and his marriage broke ______.
(3)Her health broke ________ under the pressure of work.

(4)Should another world war break ______， what would become of human beings?

8．watch out 注意；当心
watch out(for)＝ look out (for)
密切注意；留神
take care 留神，注意
watch over 照看；看守

[即学即练8](1)______ ______！ There is a car coming!
当心！有车来了！
(2)______ ______ ______ cars while crossing the road.
过马路时要当心车辆。
(3)______ ______ not to catch a cold.＝______ ______ not to catch a cold. 当心别着凉。

9. in time及时；总有一天；终于
on time按时                  at one time曾经，一度

at a time一次，同时           at times有时
at no time决不，在任何时候都不
in no time立刻，马上

[即学即练9]　(1)This kind of social phenomenon could exist only for a few months, but it will disappear __________.
(2)_____________ she wanted to be a nurse, but the thought of working at night put her off.
(3)They ran all the way to the corner just ________ to catch the bus.

四、尝试演练，合作解疑。

1.Too much carbon dioxide                      the environment.

过多的二氧化碳对环境有害.

2.Does life                 on Mars?  火星上有生命吗？

3.Their reason for doing it is still                 to me.

他们为什么要那样做此事我仍感到莫名其妙。

4.They gave their names                     .

他们依次说出自己的名字。

5.The heavy rain                 but we didn’t lose heart.

大雨阻止我们前进，但是我们不灰心丧气。

五、当堂检测，拓展延伸。

1.The heavy rain_____ us visiting the attractive lake, but we didn’t _____. A. prevented; lose the heart C. kept; lose the heart

B. prevented; lose heart    D. kept; lose the heart

2. No one can prevent the plan               .

A. to be carried out    B. from carrying out

C. not to carry out     D. from being carried out

3.This kind of social（社会的）phenomenon(现象) could exist only for a few months，but it will disappear ________.

A．in no time                B．on the time   C．at a time                             D．at one time

4. The cloud never hides the sun. The truth will be known to all ________.

A．by now                B．in time    C．at present                              D．for long

六、课堂小结，布置作业。背过本节课所学的单词及用法。