深圳牛津英语七年级英语下册第四单元 第一课时

1、Unit 4 Save the trees (第一课时)一、核心词汇1. save v.拯救2. pine n.松树3. discuss v.讨论4. branch n.树枝5. root n.根6. fight v.与作斗争7. against v.反对8. example n.例子9. harmful adj.有害的10. gas n.气体11. produce v.产生12. oxygen n.氧气13. major adj.主要的14. convenient adj.方便的15. furniture n.家具16. imagine v.想象17. disease n.疾病18. dig

2、 v.挖19. hole n.洞20. carry v.搬21. container n.容器二、重点短语1. fight against对抗，与.作斗争2. help sb. do sth. 帮助某人做某事3. know about知道，了解4. in many ways在很多方面，多角度5. take in 吸收，理解6. come from 来自（be from）7. for example 例如8. in fact 事实上，确切地说9. look around 环顾四周10. (be) made of 由制成11. millions of 大量的12. (be) good for 对有

3、好处三、基础知识点1.If I plant this seed in the ground,will it become a pear tree, Hi?(1)if 引导条件状语从句时，意为“如果”。主句（包括祈使句和含有情态动词can，may，must等的句子）用一般现在时，从句也用一般现在时；主句用过去时，从句也用过去的某种时态；如果主句是一般将来时，从句要用一般现在时表示将来。Eg: We will go out if it is fine tomorrow. You must see a doctor if you are ill.(2) a不定冠词，意为“一（个）”，用在以辅音音素开

4、头的单数可数名词前；在以元音音素开头的单数可数名词的前面要用不定冠词an。不定冠词a/an常放在单数可数名词前，表示一个不确定的事物或人。其用法如下：第一次提到某人或某物时，用不定冠词。Eg: You'd better go to see a doctor.表示某一类中的任何一个，是泛指。Eg: A dog is a useful animal.表示“一”的数量，但数的概念没有one强烈。Eg：I have a pen, a pencil and two books.用在表示时间、重量、速度、价格等名词前，意为“每一”。Eg: We have six English classes a

5、 week.2. Look around this room.与look相关的短语：look for寻找；look over仔细检查，翻阅；look after照顾；look up抬头看3. A lot of furniture is made of wood.很多家具都是由木头制成的。(be) made of(看得出原材料)=(be) made from(看不出原材料)意为“由.制成”。如：The chair is made of wood. 这把椅子是由木头制成的。Paper is usually made from wood. 纸通常由木头制成。4. But we cut down mi

6、llions of trees every year.但每年我们都会砍伐数百万的树木。millions of意为“数以百万计；大量的”。如：Millions of people around the world learn English.全世界无数人在学习英语。【拓展】：hundreds of 数以百计的，成千上万的；thousands of数以千记的，成千上万的；tens of thousands of 数以万计的；hundreds of thousands of数以十万记的注意：hundred，thousand，million，billion等前面有具体的数词时，其后不加-s，也不带介词

7、of。Eg: two hundred 200 5. She can skate at a very high speed because sh practises a lot.Practise及物动词，意为“训练，练习”。宾语可以是名词、代词或动名词。Eg: You must practise speaking English every day.6. As a result, the number of kinds of animals, birds, insects and trees in the world is decreasing.The number of意为“的数量”。Eg:T

8、he number of the students in our class is 50.【拓展】The number of的数量后接复数名词，但谓语动词要用单数形式常跟large，small等词作表语The number of the students in our school is 2000.A number of大量；许多，相当于many接复数名词作主语时，谓语动词用复数形式Number前可加small，large，huge等表示程度A number of students are playing football.7. .but the speaker did not stop sp

9、eaking until twenty past twelve.Not. Until.意为“直到才”。主句的动词一般是非延续性动词，它所表示的动作直到until所表示的时间才发生。Eg：You cannot leave until your work is finished.知识练习：1、 根据句意及首字母提示完成单词。1. Today, we are going to d_ the topic“Are dogs peoples friends?”2. Look at the dog. It is hurt. Shall we s_. It?3. The b_ of the trees con

10、nect with each other and pass water and food underground.4. You mustnt park your car here. It is a_ the law.5. The workers are f_ against the decision to reduce their pay.6. I cannot i_ life without trees.7. Soft drinks are h_ to your health.8. The f_ in the room is quite old.2、 选出可以替换划线部分的选项。1. We

11、can produce fresh water from the ocean now.A. get B. work C. make D. take2. Life is more convenient than before.A. easier B. harder C. the easiest D. the hardest3. Trees are important because they can take in harmful gases.A. make B. absorb C. stop D. put4. You can do many things at home. For exampl

12、e, you can do some housework.A. For instance B. For more C. For ever D. For you5. In fact, I didnt listen to our teacher carefully.A. Really B. Actually C. Exactly D. Certainly3、 单项选择1. The doctor gave him some pills to _ the pain.A. take off B. take in C. take on D. take away2. Do some sports every

13、 day. It will help you keep _.A. healthy B. healthily C. kindly D. excitedly3.There are _ people here in our city. Actually, there are _ people here in our city.A. millions of; three million B. millions of; millionsC. millions of; three million of D. million of; three million of4. What time is it no

14、w? It is 20:00. I think we should stop _ first.A. having supper B. have supper C. to have supper D. to having supper5、 I bought _ furniture. Really? What _? A. a new; is it made of B. a new; does it made ofC. a new piece of; is it made of D. a new piece of; does it made of6、 Look at this old bridge!

15、 It is made _ stones. A. from B. of C. into D. up7、 I _ the swimming club if you _ it. A. join; join B. will join; join C. join; will join D. will join; will join8、 He heard someone calling his name, so he stopped and _. But he couldnt see any one. A. looked around B. looked up C. looked into D. loo

16、ked for9、 We cant live without trees. They make our lives _. I agree. We should stop people _ trees. A. convenient; to cut down B. conveniently; to cut down C. convenient; cutting down D. conveniently; cutting down10、 the little dog helps his owner _ many ways _ his daily life. A. in; at B. on; in C

17、. in; in D. on; on4、 用所给单词的适当形式填空。1. Trees are important in our (day) lives?2. There are (many) people in this hall than that one.3. We all know that smoking is (harm) to our health.4. Air is a mixture(混合物) of (gas).5. Mr. Green lives in a (convenience) life.6. Tim has been a fire (fight) for five y

18、ears.7. How does a fish (breath) under water?8. Many plants died because of the water (pollute) .5、 完形填空 A Chinese man _1_ Cai Lun invented paper almost 2,000 years ago. He made paper _2_ wood. He then put all the paper together and made the paper _3_ a book. Now we still use wood to make paper. We

19、use a lot of paper every day. If we keep on _4_ so much paper, there will not be any trees left on the earth. If _5_ no trees, there will be no paper. Every day, people _6_ about 2,800 tons of paper. We use 17 trees to make one ton of paper. This means we are cutting nearly 48,000 trees every day. S

20、ince it _7_ more than 10 years for a tree to grow, we must start using _8_ paper now. So how can we save paper? We can use both sides of _9_ paper, especially when we are making notes. We can choose drinks in bottles instead of those in paper packets. We can also use cotton handkerchiefs(手帕) but not

21、 paper ones. When we go shopping, we can use fewer paper bags. If the shop assistant gives us a paper bag, we can save it and reuse it later. Everyone can help to save paper. If we all think carefully, we can help _10_ trees. But we should do it now, before it is too late. 1. A. call B. calls C. cal

22、led D. calling 2. A. from B. of C. into D. for 3. A. from B. of C. into D. for 4. A. waste B. to waste C. wasted D. wasting 5. A. there will be B. there are C. there was D. there wasnt 6. A. take in B. put on C. throw away D. put away 7. A. spends B. takes C. costs D. pays 8. A. many B. few C. fewer

23、 D. less 9. A. a B. a piece C. one piece D. many 10. A. protect B. protects C. protecting D. to protecting6、 阅读理解Can trees talk? Yes - but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a will

24、ow tree (柳树) attacked in the woods by caterpillars (毛毛虫) changed the chemistry of its leaves and made them tasteless so that the caterpillars got tired of the leaves and stopped eating them. The even more astonishing, the tree sent out a special vapor- a signal causing its neighbors to change the ch

25、emistry of their own leaves and make themselves taste also terrible, too.Talking, of course, doesnt need to be always in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds and movements. Bees

26、 dance their signals, flying in certain patterns that tell other bees where to find nectar (花蜜) for honey. So shy shouldnt trees have ways of sending messages? 1、From the passage, which kind of leaves dont caterpillars eat? A. leaves lying on the ground. B. leaves having an unpleasant taste.C. leave

27、s bees dont like. D. leaves having an unfamiliar shape. 2、The willow tree described in the passage protected itself by _.A. growing more branches B. talking with birds and bees.C. changing its leaf chemistry D. shaking caterpillars off 3、According to the passage, the willow tree was able to talk with other trees by _.A. Waving its branches B. giving off a special smellC. dropping