Unit 2 Topic 2 Section C
【学习目标】
1.能够利用多种阅读技能,如预测、获取大意、猜测词义等技能,完成阅读任务。能根据不同的阅读目的,运用简单的阅读策略获取信息,提高阅读技巧。
2.认识到各种环境问题,如臭氧空洞、温室效应等,意识到环境问题的严峻形势,能用英语的形式表达环境问题的成因及危害。
【预习导学】
一、生词速查
1. n.洞,坑
2. v.(使)出现; (使)形成 n.种类;形式
3. v.上升; 起床; 升起→ (过去式)→ (过去分词)
二、短语速记
1.在此期间
2.数百万
3.拿走
4.穿过
5.臭氧层
6. 二氧化碳
7.温室效应
8.提到;涉及;有关
三、句子速译
1.Some things we have done are very good for the earth while others are bad.
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2.All over the world, people have cut down millions of trees.
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3.When it rains or when the wind blows, the earth is taken away.
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4.Too much harmful radiation from the sun passes through the hole and reaches the earth directly.
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5.The heat from the sun can't escape so the temperature is rising.
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四、想一想
预习课本1a,回答下列问题。
1.How old is the earth
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2.What bad things have people done for the earth
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【答案】
一、
1.hole
2.form
3.rise rose risen
二、
1.during this period
2.millions of
3.take away
4.pass through
5.ozone layer
6.carbon dioxide
7.the greenhouse effect
8.refer to
三、
1.我们做的一些事情对地球非常有益,而另一些是有害的。
2.在全世界,人们已经砍伐了数百万棵树。
3.当刮风下雨的时候,土就被刮走或冲走。
4.太多来自太阳的有害辐射穿过黑洞直接到达地球。
5.来自太阳的热量无法散去,因此温度不断上升。
四、
1.It is 4.6 billion years old.
2.They are traffic pollution, fewer trees, factory pollution, the ozone hole and more carbon dioxide.
【合作探究】
任务驱动一阅读训练
1.阅读技巧:如何选择合适的标题
(1)快速浏览每一段的第一句和最后一句,因为通常主题句就位于每段的第一句或最后一句;
(2)阅读第一段和最后一段,通常第一段引出文章要写的话题,最后一段总结全文;
(3)检验答案是否正确,把所选答案反过来想想,如果选了这个,那文章应该是怎么样的。
任务驱动二 小组活动
1.利用现代的网络资源,搜集整理有关环保问题的信息,以及这些问题对环境产生的影响。并进行小组交流,做好笔记。完成课本2的讨论。
2.在完成课本1c和课本2的基础上进行写作,同伴互评,找出优缺点。范文如下:
As we all know, water pollution is becoming more and more serious.Some factories pour waste water into the rivers.As a result, it makes the water dirty and smell terrible.Most of fish in the water have died and we can't swim in the water.Water is very important to human beings, so we should do our best to protect and save it.Luckily, our government is taking measures to protect the water from pollution.
【知识超市】
[命题点一]while的用法
●Some things we have done are very good for the earth while others are bad.我们做的一些事情对地球非常有益,而另一些是有害的。
◎观察思考:1.They all went out while Mary stayed at home.他们都出去了,玛丽却留在家里。
2.While I was doing my homework, my mother was cooking.我做作业时,我妈妈在做饭。
3.We are going away for a while.我们将离开一会儿。
◎用法总结:1.while可用作并列连词,意为“而;却”,表示对照关系。
2.while还可用作从属连词,意为“在……时”,常用来引导含有延续性动词的时间状语从句,表示一个动作在进行的同时,另一个动作也在发生。
3.while 还可用作名词,意为“一会儿;一段时间”。
对点自测
把下列句子翻译成英语
1.有些人浪费粮食,然而有些人却吃不饱。
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2.吉姆正在摘苹果,凯特正在把苹果搬到卡车上去。
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3.等一下,我会来帮你的。
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【答案】
1.Some people waste food while others don't have enough.
2.While Jim is picking apples, Kate is carrying apples to the truck.
3.Just wait a while, and then I will help you.
[命题点二]rise的用法
●The heat from the sun can't escape, so the temperature is rising.来自太阳的热量无法散去,因此温度不断上升。
◎观察思考:1.The water in the river is rising slowly.河水在慢慢上涨。
2.The sun rises in the east.太阳从东方升起。
3.He raised his voice.他提高了音量。
◎用法总结:1.rise是不及物动词,意为“升起,上升”。说明主语自身移向较高的位置。
2.raise是及物动词,意为“举起;提起;抬高”,说明主语发生的动作要作用于其他事物。
对点自测
用rise和raise的不同形式填空,完成句子
1.The sun in the east and sets in the west.
2.The chairman from his chair and made a speech.
3.We must the living standard of the people.
4.His speech my interest.
5.The price of the meat a lot recently.
【答案】
1.rises
2.rose
3.raise
4.raised
5.has risen
2