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1、Unit 4 Save the trees (第一课时)一、核心词汇推荐精选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.
2、 dig v.挖19. hole n.洞20. carry v.搬21. container n.容器推荐精选二、重点短语推荐精选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)
3、 good for 对有好处推荐精选三、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
4、为“一（个）”，用在以辅音音素开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: Youd 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 Englis
5、h classes a 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
6、cut down millions of trees every year.但每年我们都会砍伐数百万的树木。推荐精选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
7、词时，其后不加-s，也不带介词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
8、 of意为“的数量”。Eg:The 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
9、did not stop speaking 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：一、 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_ o
10、f the trees connect 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.二、 选出可以替
11、换划线部分的选项。1. We 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 h
12、ome. For example, 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. Certainly推荐精选三、 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. D
13、o some sports every 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.
14、 What time is it now? 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! It is made _ stones. A. from B. of C. into D. up7、 I _ the swimming club if you _ it. A. join; join B
