资源简介

(共20张PPT)
Unit
6
The natural world
Unit
7
Reading 2
学习目标
通过本节课的学习，同学们能够:
1.运用略读、寻读等阅读技巧,快速从文本中找出海洋、湿地、森林的面积占比等关键信息。
2.认识到保护海洋、湿地、森林是全人类共同的责任，理解不同国家和地区在生态保护方面的共同追求。
3.熟练掌握核心词汇并运用 “It covers...”“They help...by...” 等句型来介绍生态系统的特征和作用;能够用英语简单复述三大生态系统的
主要信息,在小组讨论中清晰表达自己对生态系统的认识。
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
根据短文内容用所给出的词适当形式或汉语意思填空
includes
sizes
to play
(to)keep
covers
produces
plenty of
returns to
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
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 动词，意为“包括”，强调一个整体包含着若干个独立部分,或者一个东西包含着另一个东西的一部分。
including 是include的动名词形式,但通常独立用作介词,意为“包括……在内”，常和前面的内容用逗号隔开。
【对点练习】
1.Our group _______ Tom and Tim. There are altogether 8 students.
A. included B. includes C. including D. include
2.Ten friends went to her birthday party, ____________ (include) me.
Language points
B
including
2.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 作副词,意为“大约”，用于表示数量、时间、年龄等的不确切或近似数。
around 还可以作介词，意为“在……周围”。
look around 意为“环视；向四周看”。
【对点练习】
1.Ten years later, _______________ (大约) 4, 700 species (物种) unknown before from the ocean floor were discovered.
2.现在有超过20 种鸟生活在这条河流的周围。_______________________________________________________________
around/about
Now, there are more than 20 kinds of birds living around the river.
3.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
拓展:
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。
He held a pen in one hand and a ruler in the other.他一只手拿着钢笔另一只手
拿着尺子。
We’ll hold a sports meeting next week.下周我们要举行运动会。
Hold on, please. I’ll get my friend.请别挂断，我去叫我的朋友。
They decided to hold off(推迟) the meeting until next Sunday.
【对点练习】
1.The CR450 can travel at a top speed of 453 kilometers an hour and it can ______
(容纳) many passengers.
2.由于天气原因，我们只好把运动会推迟到下周。
We had to___________ _____the sports meeting till next week because of the
weather.
hold
hold/put off
(2)return 作动词,意为“返回;回去,回来”,常用短语:return to +地点,意为“返回某地”。
return 还可以表示“归还”,构成短语:return sth. to sb. 把某物归还给某人
例: He returned to his hometown after many years.多年以后他返回了家乡。
You must return the book to the library before Monday.周一以前你必须把书还
给图书馆。
【对点练习】
1.We _________ the books to the library after we read them.
A. returned B. pointed C. waved D. caught
2.然后他们返回到他们自己的座位。
Then they __________ ________ their own seats.
A
returned to
4.Wetlands can also help prevent floods.湿地也有助于防止洪水。
prevent 作动词,意为“防止,阻止”,后面可以直接加名词或代词作宾语。prevent sb. from doing sth. 是其常用短语，意为“阻止某人做某事”。
例:We tried to prevent him, but we failed.我们试图阻止他，可是没有成功。
The rain prevented us from going out to play.雨阻止了我们外出玩耍。
【对点练习】
1.We should try our best ___________ (prevent) home fires.
2.父母总是试图阻止孩子玩太多游戏。
Parents always try to their children ______ _______ games too much.
to prevent
prevent from playing
5.During heavy rains, wetlands store water like giant sponges.在大雨期间，湿地像巨大的海绵一样储存水。
store 作动词,意为“贮存；存储”,后面可以直接接名词作宾语。store up 意为“储存；积累”。
例:The pond stores much rainwater in summer.这个池塘夏天储存很多雨水。
store 还可以作名词，意为“商店；仓库”。
例:You can see a book store across from the bank.在银行对面你可以看到一家书店。
【对点练习】
1.You should s these fruits in the fridge to keep them fresh.
2.动物们需要为冬天贮存食物。
Animals need ______ ______ ______ food for winter.
tore
to store up
6.They act like the “kidneys” of the earth.它们就像“地球的肾脏”。
act 可作不及物动词,意为“起作用;行动”,也可作及物动词,意为“扮演”,主要表示以下意义：(1)起作用:表示某种东西或话语对另一种东西或某人产生影响；
(2)行动:表示采取行动来解决问题或实现目标；(3)表现:表示人的行为方式，描述人的举止或态度；(4)扮演:表示在戏剧或电影中扮演某个角色。
take action 采取行动 act as 充当；担任
【对点练习】
1.The medicine a quickly on her, and she felt better.
2.We should take _______ (act) to protect animals in danger.
3.在自然界中，森林扮演了自然卫士的角色。
In nature, forests ______ _____ the natural guardians.
cted
action
act as
7.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。
If we don’t, the plastic will harm the balance of the ocean ecosystem.如果我们不这样做,塑料将破坏海洋生态系统的平衡。
harm可作动词或名词,意为“伤害;损害”,其形容词形式是harmful,意为“有害的”。
常用短语:do harm to 意为“对……有害”(harm 是名词);be harmful to 意“对……有害”。
【对点练习】
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
8.Plants in wetlands help get rid of pollution and make the water clean.湿地中的植物有助于消除污染,使水变得清洁。
get rid of 意为“清除；摆脱；丢弃”,表示清除某种不良影响；摆脱某人或某种困境；丢弃不想要的物品等。
例:The cleaners are getting rid of(清除) the snow on the road.
The hunter wanted to get rid of(摆脱) the wolf, but he couldn’t.
【对点练习】
1.He ________ the clothes because they are old.
A. looked out of B. took care C. got rid of D. kept away
2.我们必须要清除这个地区的污染。
We must ______ _______ ______ the pollution in this area.
C
get rid of
9.Forests make up nearly a third of the earth‘s land area.森林占地球陆地面积的近三分之一。
make up 的意思主要有:(1)占据总量中的一定分量(2)编造故事或借口(3)组成(一个集体或团队)(4)化妆；打扮。
例:Women teachers make up(占据)a half of the teachers in this school.
The teacher made up(编造)a funny story for his new lesson.
【对点练习】
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
10. Each of these ecosystems support millions of plants and animals.
这些生态系统中的每一个都支持这数以百万计的动植物。
millions of 数以百万计的
例:You can see millions of stars in the sky at night.
Thousands of tourists come to Beijing every year.
【对点练习】
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
11.It’s time for us to take action and protect the ocean. 是我们采取行动和保护海洋的时候了。
It’s time （for sb.) + 动词不定式.是一种常用的句式结构，意为“（某人）该做某事了”。也可以直接使用“It’s time for + 名词”。
例:It’s time to have lunch. 该吃午饭了。
It’s time for children to go to bed. 孩子们该睡觉了。
【对点练习】
1.It’s time for governments _______ action against climate change.
A. to take B. take C. takes D. taking
2.It’s time to have an English class. （改为同义句）
_________________________
A
It’s time for an English class.
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
THANKS
本课结束

展开更多......

收起↑