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(共21张PPT)
Unit 7 The natural world
Reading Ⅱ
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.
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
What is an ecosystem
It includes all the living and non-living things in an area.
Look! This is my cute fish tank. We can often see such s_____ ecosystems in an office or at home. It i______ not only some fish but also plants. The n_______ things around, like the stones and water, are also part of it. Every time I see it, I feel r______.
mall
ncludes
elaxed
on-living
include
包括
including
包括……在内”，常和前面的内容用逗号隔开
我们小组包括汤姆和吉姆
Our group includes Tom and Jim.
他已穿戴好了，包括鞋子。
He was fully dressed, including shoes.
It includes all the living and non-living things in an area.
How much do they cover/ make up
The ocean
Wetlands
Forests
around 71% of the earth’s surface.
6% of the earth’s land area.
nearly a third of the earth’s land area.
Green spaces __________________(≈ 45%) of the city’s built-up areas.
cover/ make up about 45%
1.The big bed ________ almost half of her bedroom.
A. cuts up B. puts up
C. turns up D. makes up
2.尽管你迟到了可是你不应当编造借口。
Although you were late, you shouldn’t ________ ______ excuses.
D
make up
make up 形成构成；编造；化妆
How important are they
Each ecosystem has a role to play help keep the balance between all their member
= play a role
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.
What do they do for our earth
produce ________
the ocean
hold ________
oxygen
salt water
(1)hold vt. 容纳；拿着；举行
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
hold back 阻止 抑制
the ocean
rise to the sky
fall onto the land
return to the ocean
rise rose 升高 上升（不及物动词）
raise raised 举起 饲养 募集 （及物动词）
return to +地点 “返回某地”
return “归还”return sth.to sb.把某物归还给某人
Get rid of pollution.
Make the water clean
Help prevent floods
Store water like sponges.
Home to plants and animals
Act like the “kidneys”
wetlands
Plants in wetlands help get rid of pollution and make the water clean.
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。
你最好改掉这些坏习惯
You had better get rid of these bad habits.
wetlands can also help prevent floods.
prevent 防止,阻止
后面可以直接加名词或代词
prevent sb. (from） doing sth.“阻止某人做某事”
stop sb. ( from) doing sth.
雨阻止了我们外出玩耍。
keep sb. from doing sth.
The rain prevented us from going out to play
Some businessmen change the wetlands into tall buildings, meaning less space for wildlife.
Factories also put wastewater into the wetlands.
Tourists may throw rubbish carelessly.
We should prevent businessmen _______________________________
_______________________________.
We should also prevent factories _______________________________
_______________________________.
Moreover, we prevent tourists___
_________________________________.
from changing the wetlands into tall buildings
from putting the wastewater into the wetlands
from throwing rubbish carelessly
wetlands store water like huge sponges.
store
贮存;存储 v
商店;仓库 n
A. take in carbon dioxide
C. trap harmful things
harmful adj.
be harmful to
harm vt. & n.
harm ...
do harm to ...
Forests face big problems from human activities. Cutting down trees and polluting rivers near forests _____________________(伤害动植物). These actions are _______ to the whole ecosystem. We must stop these to protect forests.
harm plants and animals
harmful
B. produce oxygen
E. help clean the air
D. harm the balance
吸收
欺骗
1. Many people worry that too much screen time will ______ (harm) their children.
2.Fire is _________(harm). Keep your children away from it.
3.喝太多果汁对儿童的牙齿有害。
Drinking too much juice can
________ ________________ ____ children’s teeth.
harm
harmful
do/be harm /harmful to
对着屏幕时间过长可能对你的眼睛有害
Too much screen time may be harmful to your eye.
Each of these ecosystems support millions of plants and animals.
millions of 数以百万计的
You can see millions of stars in the sky at night.
1.People plant ______ trees on Tree Planting Day every year.
A. hundred B. hundreds of C. hundreds D. hundred of
2.冬天，数以百万计的鸟儿飞向南方。
In winter, __________ ______ birds fly to the south.
B
millions of
Xuanwu Lake is not just a beautiful park, but a key ecological friend for us. It _____ plenty of clean water. By controlling runoff (调节径流), it helps ________ the local water cycle. What’s more, the lake’s wetland areas can store rainwater to ________ small floods. It also ____________ in slowing down the urban heat island effect (城市热岛效应), keeping the areas around cooler.
play a role
hold
produce
prevent
support
holds
support
prevent
plays a role
一、用所给单词的适当形式填空
1. The famous actress (act) in many films.
2. When hearing the death of his pet dog, the boy cries (sad).
3. Farmers produce millions of (ton) of wheat to feed the nation.
4. The smoke from cigarettes (香烟) (harm) not only smokers
but also other people.
当堂检测
acted
sadly
tons
harms
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

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