资源简介

(共21张PPT)
Unit7 The natural world
Reading 2
Retell the passage
Review
The big three: oceans, wetlands and forests
An ecosystem _________(include) all the living and non-living things in an area. Ecosystems can be of different ______(size), from small ponds to large grasslands.
Each ecosystem has a role _______(play) and helps _________(keep) the balance between all its members and the greater environment.
The ocean is a very large ecosystem on earth. It _______(cover) around 71% of the earth’s surface and __________(produce) about 70% of the earth's oxygen. It holds __________(很多) salt water, and the water rises to the sky, falls onto the land and then ___________(返回到) the ocean. This goes on and on, so the ocean is just like the “heart” of the earth.
Review
includes
sizes
to play
(to)keep
covers
produces
plenty of
returns to
用括号中所给词的正确形式填空。
Wetlands only cover about 6% of the earth’s land area. But they ____________
(是……家园) about 40% of all the types of plants and animals. Plants in wetlands help ______________(清除) pollution and make the water clean. Wetlands can also help ____________(prevent) floods. During heavy rains, wetlands _______
(储存) water like giant sponges. They act like the “kidneys” of the earth.
Forests _________(占据) nearly a third of the earth’s land area. Plants there ________(吸收) carbon dioxide from the air and produce oxygen. They also trap _________(harm) things in their leaves and help clean the air. __________(因此),
people often call forests the “lungs” of the earth.
Each of these ecosystems supports _____________(数百万) plants and animals.
They keep the planet healthy and make our world a better place.
are home to
(to) get rid of
(to)prevent
store
make up
harmful
take in
Therefore
millions of
05
If oceans were damaged seriously, how would our daily life change
Tips：Think about oxygen, water, food...
Further thinking
surface
is home to
Post-reading
oxygen
take in
store
role
get rid of
balance
Post-reading
Language points
Language points
1.An ecosystem includes all the living and non-living things in an area. 生态系统包括一个地区的所有生物和非生物。
include
包括
including
包括……在内”，常和前面的内容用逗号隔开
行程包括其他几项活动。
The trip include a few other events.
他已穿戴好了，包括鞋子。
He was fully dressed, including shoes.
2. Each ecosystem has a role to play...
Language points
play a role
发挥作用；扮演角色
play an important role in...
在......中起重要作用
play the role of...
扮演......的角色
他同意演那个医生的角色。
He agreed to play a role of the doctor.
Language points
3.It covers around 71% of the earth‘s surface and produces about 70% of the earth’s oxygen. 它覆盖了地球表面约71%的面积，产生了地球上约70%的氧气。
around
大约、在……周围
look around
环视；向四周看
现在有超过20 种鸟生活在这条河流的周围。
Now, there are more than 20 kinds of birds living around the river.
Language points
4.It holds plenty of salt water, and the water rises to the sky, falls onto the land and then returns to the ocean. 它含有大量的盐水,水上升到天空,落在陆地上,然后回到海洋
(1)hold vt. 容纳；拿着；举行
hold 作动词，有以下几种意义：
①容纳：指某个空间的大小能装下一些人或物；
②拿着：指用手拿着某些物品；
③举行：指举行会议或活动；
④承载、支撑：指承载某种物体的重量。
hold on 别挂断电话；稍等
hold off = put off 推迟
例：The room can hold 200 people.这个房间可以容纳200人。
Language points
plenty of
大量的、充足的(修饰可数名词复数或不可数名词)
这座城市有很多开阔的空地。
The city has plenty of open space.
不必担心。我们有很多时间。
Don't worry. We have plenty of time.
Language points
5. Plants in wetlands help get rid of pollution and make the water clean. 湿地中的植物有助于清除污染，使水变得洁净。
get rid of
清除、去掉、摆脱
我这头疼老也不好。
I can't get rid of this headache
他们试图摆脱掉我。
They were trying to get rid of me.
Language points
6. They act like the kidneys of the earth.
act like
表现得像; 起......作用
试着表现得像个好孩子。
Try to act like a well-behaved child.
你表现得像只鸭子。
You act like a duck.
Language points
7.Wetlands can also help prevent floods.
湿地也有助于防止洪水。
prevent
防止,阻止
prevent sb. from doing sth.
阻止某人做某事
雨阻止了我们外出玩耍。
The rain prevented us from going out to play.
Language points
8.They also trap harmful things in their leaves and help clean the air.它们还能在叶子中捕获有害物质，帮助清洁空气。
do harm to/be harmful to
对……有害
果汁可能损坏儿童的牙齿。
Fruit juices can be harmful to children's teeth
对着屏幕时间过长可能对你的健康有害
Too much screen time may be harmful to your health.
三、选词填空。
harm, tons, pond, got rid of, around, returned
1.Spending too much time on your smartphone may ________________ your eyes.
2.They will arrive at ________________ 8:40 p. m.
3.He finally ________________ his glasses after an eye operation.
4.The old man finally ________________ home to be with his family.
5.Each of these containers (集装箱) weighs about thirty-two ______.
harm
around
got rid of
returned
tons
Practice
二、根据中文提示完成句子
1.玩具店充满了不同尺寸的动物玩具，吸引很多孩子的注意。
The toy store is filled with animal toys , attracting
many children's attention.
2.作为青少年，我们需要在与家人共度时光和与朋友外出之间保持平衡。
As teenagers, we need to ____________________________ spending time with our family _____ hanging out with friends.
3.考试失利后，我决定摆脱悲伤，为下一次考试更加努力。
After failing the exam, I decided and start
the next one.
4.每个人在社会中都扮演重要角色，所以我们必须尽最大努力为社会服务。
Everyone in our society, so we must
serve our society.
5.我们村庄里百分之六十的水来自池塘，池塘里有各种各样的鱼。
Sixty percent of the water comes from the pond, it all kinds of fish in it.
of different sizes
keep the balance between
and
to get rid of sadness
to work harder for/in
has an important role to play
try our best to
is home to
是…… 的家园
清除；去除
预防洪水
absorb harmful things
be home to
get rid of
prevent floods
吸收有害物质
ecosystem
oxygen
二氧化碳
表面
生态系统
氧气
carbon dioxide
surface
Practice
1. Finish the exercises.
2. Recite the underlined sentences on Page
Homework

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