Language points导学案

第二课时 language points
teaching aims:
 master the words and useful expressions in the text.
 using the language points.
课前预习
1. match the words and the explanations:
in time                  下蛋
        lay eggs                  产生；分娩
        give birth to             及时；终于
        in one’s turn            阻止；制止
        prevent … from           轮到某人；接着
2. read the explanation and speak out the word it explains.
causing harm   adj.             
    sudden and powerful; using force to hurt or attack adj.        
    to be, or to be real; to live, or to live in difficult conditions        
the number 1 000 000 000                
the mixture of gases around the earth; a feeling that a place has of being pleasant
and interesting or exciting  n.          
课堂学习 
task 1: understanding.
a.match the phrases underlined with their correct meaning.
1.they were in time to produce carbon, nitrogen, water vapour and other gases.
2.they multiplied and filled the oceans and seas with oxygen.
3.carbon dioxide prevents heat from escaping from the earth.
4.it was not immediately obvious that water was to be fundamental to the development of life.
a. increase in number       b. important
c. stop/keep…from          d. after a long period of time
b.try to find a sentence that can be replaced by the following one:
now it’s their turn to be the most important animals on the planet
c.translate the following sentence. 
1.it was not immediately obvious that water was to be fundamental to the development of life.
2. that made it possible for life to begin to develop.
task 2 learning the languages points:
1.it exploded loudly with fire and rock,which were in time to produce the water vapor,carbon dioxide,oxygen,nitrogen and other gases,...
它（地球）巨大的爆炸喷出了烈火与岩石，最终产生了水蒸气、二氧化碳、氧、氮和其他多种气体，……
例句:
i was just in time for the flight. 我刚好来得及赶上那班飞机。
与time相关的短语   in no time立即，立刻　 at any time 在任何时候 at one time曾经，一度 at times 有时，偶尔 on time按时，准时     of the time现在的，当时的 2.it allowed the earth to dissolve harmful gases,which had become part of the earth’s atmosphere,into the oceans and seas.
它使地球把曾经存在于大气层中的有害气体溶解在海洋里
  例句:
the reading room doesn’t allow smoking. 阅览室不准吸烟。
people are not allowed to spit in public. 不许当众吐痰。
3.this encouraged the development of early shellfish and all sorts of fish.
这促进了早期贝壳类动物和各种鱼类的生长发育。
例句:
there have been many new developments in gene. 基因方面已经有几项新的发展。 father watched the development of his baby with interest. 爸爸充满兴趣地看着孩子的成长。
4.they were the last group of animals and they were different because they produced their young from within their bodies.
它们是最为进化的一类动物。从体内生产出幼仔是它们不同与以往动物的特征。
    例句:
they are quite different in their tastes. 他们的品位差异很大。
my opinion is different from yours.我的意见和你的不同。
5.small clever animals,now with hands and feet,appeared and spread all over the earth.
一些小巧聪明，长着手脚的动物出现了，它们散布在地球各个 地方 。
例句:
mum spread a new cloth bought in the supermarket on the table when we had dinner.
我们吃饭时妈妈在桌子上铺上一条从超市买来的新桌布。
he spread out his arms to welcome us warmly.
他张开双臂热情地欢迎我们。
6.they are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.
他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去
与这种结构相似的有stop sb./sth.(from) doing sth.（from可以省略） 和keep sb./sth.from doing sth.（from不可以省略）。
随堂检测
一、短语填空
in time　on time　in no time　at one time　at times　at any time
(1)—why are you in a hurry to leave here?
—get home ______ to bathe the children.
(2)these buses are never ______ and the passengers are always complaining.
(3)i am away,please call me ______ if someone come to see me.
(4)you can’t imagine this lake used to be a beautiful place in our province ______.
(5)he rushed out of the kitchen ______ when he heard the shout.
(6) ______ i sit silently and wonder if this kind of job is worth all the effort.
二、选择填空
(1)—how are you getting on with your project? —______ your speed.
a.twice faster than b.twice as faster as c.double d.as twice as
 (2)the house rent is expensive.i have got about half the space i had at home and i am paying ______ here.
a.as 3 times much b.as much three times c.much as 3 times d.3 times as much
(3)in dry weather the flowers will have to be watered if they _____.
a.have survived　b.are to survive c.would survive   d.will survive
(4)it was the boy,rather than his teachers _____ for what the boy had done.
a.are to blame　　b.are to blamed c.is to blame   d.is to be blamed
（5）_____ your father have bought a new bike for you,it’s no use going to the shop to buy another one.
a.now that   b.although c.after all   d.because of
homework
 read the text