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(共39张PPT)
Unit 7 The natural world
八年级
译林版2024
上
课文解析一
1.Half of the world's animals and plants live in rainforests.
世界上一半的动植物生活在雨林中。
[用法讲解] half在此处为名词，译为“一半”，其复数形式为halves;half还可为形容词，译为“一半的”;half亦可为代词，译为“一半”。
Eg: Halfof the students in the class are girls.
班上一半的学生是女生。
She spent half the day reading.
她花了大半天时间读书。
I gave her half and kept half for myself.
我给了她一半，自己留了一半。
[常见搭配] half of...一半的...(作主语时，谓语动词由后面名词决定)
go halves (with sb.)和某人平摊
half past ...…半
Eg: Half of the books have been placed on the shelves.
一半的书被放在架子上。
Half of the water is polluted.
一半的水被污染了。
We have to go halves on the phone bill.
我们得平摊电话费。
It's half past twelve now.
现在十二点半。
[即学即用]
Half of the students _______ (be) absent today because of heavy rain.
are
2.Coral reefs look like rocks, but they support a lot of life in just a small area.
珊瑚礁看起来像岩石，但它们在一小块区域内维系着大量生命。
[用法讲解]support在此处为动词，译为“维持、养活、支持、拥护”;support也可为不可数名词，译为“支持”。
Eg: The environment of Mars could not support life.
火星的环境无法维持生命。
This land can't support many cows.
这块土地养了许多牛。
I hope you can support me in this.
我希望你能在这一点上支持我。
The project received financial support from the government.
这个项目得到了政府的财政支持。
[常见搭配]support sb. in doing sth.支持某人作某事
with/ without one's support在/没有某人的支持下
in support of sb./ sth.支持某人/某事
Eg: My parents support me in pursuing my dream.
我的父母支持我追求我的梦想。
We couldn't win the match without your support.
没有你们的支持我们赢不了这场比赛。
She spoke in support of Tom's plan.
她发言支持汤姆的计划。
[派生词]supporter为名词，译为“支持者”;
supportive为形容词，译为“支持的、给予帮助的”。
Eg: She was a supporter of the free market economy.
她是自由市场经济的支持者。
The silent majority of supportive parents and teachers should make their views known.
表示支持的父母和老师是沉默的大多数，他们应该公开表达他们的观点。
[即学即用]
他们举行集会支持新政策。
They held a rally _______ ________ ______ the new policy.
in support of
3.Grasslands often lie between deserts and forests.草原常位于沙漠和森林之间。
[用法讲解] lie在此处为动词，译为“位于”，也可译为“躺、说谎”。
注意:译为“位于、躺”时，其过去式为lay，过去分词为lain;译为“说谎”时，其过去式为lied，过去分词为lied。
Eg: Japan lies to the east of China.
日本位于中国的东面。
She lies on the sofa every afternoon.
她每天下午躺在沙发上。
He often lies about his work.
他经常谎报工作。
[常见搭配]lie to ...位于...(不接壤)
lie on...位于...(接壤)
lie in...位于...(范围内)
lie off...位于...(隔一段距离)
lie to sb.多某人说谎
Eg: Russia lies on the north of China.
俄罗斯位于中国的北方。
Liaoning lies in the north of China.
辽宁位于中国被北方。
The island lies off the coast.
岛屿位于海岸外。
He often lies to his parents.
他经常对父母说谎。
[即学即用]
( )Beijing lies _______ the northwest of Shanghai.
A.to B.on C.in D.off
A
4.The polar ice is home to animals like polar bears and penguins.
极地冰原是北极熊和企鹅等动物的家园。
[用法讲解]be home to译为“是...的栖息地/家园/所在地”。
Eg: The Amazon Rainforest is home to many unique species.
亚马孙雨林“是许多独特物种的栖息地。
[即学即用]
这个小镇是那位著名诗人的故乡。
This small town _______ ______ ______ the famous poet.
is home to
5.The climate in deserts is so awful that only a few animals and plants can live there.
沙漠的气候非常恶劣，只有少数动植物能够在那里存活。
[用法讲解]“so ... that从句”，译为“如此...以至于...”，so是副词，后接形容词或副词，表示程度，that从句表示结果。
Eg: It was so cold outside that we had to stop the game.
外面天太冷了，我们不得不停止比赛。
[知识拓展]“such ... that从句”，译为“如此...以至于..”，such后需接名词(短语)。
“so + many/ much/ few/ little +名词 +that从句”译为“如此多/少...以至于..”。
Eg: She is such a good teacher that we all like her.
她是一位很优秀的老师，所以我们都喜欢她。
There are so many people in thehall that we can't find a seat.
大厅力有如此多的人以至于我们找不到座位。
[即学即用]
( ) Beijing has _______ many buses that there is often a traffic jam in rush hours.
A.so B.such C.too D.very
A
6.Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment.
每个生态系统都要发挥作用，从而帮助保持其所有成员和更大的环境之间的平衡。
[用法讲解]“play a role in (doing)”译为“在...中起作用/扮演角色”。“play a role as...”译为“担任..的角色”。
Eg: Technology plays a role in modern education.
技术在现代教育中起作用。
He played a role as the team leader.
他担任了团队领导的角色。
She played a role in designing the logo.
她参与了标志的设计。
[即学即用]
阳光在光合作用中起作用。
Sunlight __________________ photosynthesis.
plays a role in
7.It holds plenty of salt water, and the water rises to the sky, falls onto the lands and then returns to the ocean.它容纳大量海水，水分升上填空，落到陆地上，然后流回海洋。
[用法讲解]“plenty of...”后既可接可数名词复数，也可接不可数名词。
Eg: There are plenty of books in the library.
图书馆里有大量的书。
We have plenty of time to finish the work.
我们有大量的时间来完成这项工作。
[用法讲解]return在此处为动词，译为“返回、回来、归还”，return还可为名词，译为“返回、回来、恢复”。
Eg: He will return home tomorrow.
我明天会回家。
The patient is slowly returning to health.
病人正在逐渐恢复健康。
The return of the investment was very high.
这项投资的回报率很高。
[常见搭配] return sth. to sb./ sth.把某物归还给某人/某处
return to +地点 = go back to地点回到某地
in return作为回报(强调一种行为或态度的回应)
in return for ... 作为对...的回报(强调一种明确的、具体的交换关系)
Eg:I returned the book to the library.
我把书还给了图书馆。
They will return to the office after the meeting.
会议结束后，他们会返回办公室。
She helped me move, and I cooked dinner in return.
她帮我搬东西，作为回报我做晚饭。
He gave me a gift in return for my help.
他给了我一份礼物以报答我的帮助。
[易混辨析]rise, arise与raise区别:
rise (动词)“上升”表示由低到高的变化过程，强调主语自身移向较高位置。
arise (动词)“起身”主语发出的动作，作用到其它事物。
raise (动词)“举起”表示把具体事物举到高处。
Eg: The sun rises.
太阳升起来了。
He arises to greet her.
他起身向她问候。
He raises his hand to answer questions.
他举手回答问题。
[即学即用]
1.在会议开始前我们有大量的时间。
We have ________ _______ time before the meeting starts.
( )2. Last year the advertising rate _______by 20 percent.
A.raised B. rose C. arose D. went down
( )3. I don't know when we will ______ Beijing.
A.return back B.return to
C. return back to D.return
plenty of
B
B
8.This goes on and on, so the ocean is just like the “heart”of the earth!
这个过程循环往复，所以海洋就如同地球之心。
[用法讲解]“go on”译为“(情况、形势)继续下去、持续、继续做某事、(灯)亮、通(电)、流逝、发生、进行”等。
Eg: We hope the nice weather will go on for the weekend picnic.
我们希望这样的好天气将持续到周末野餐的时候。
He went on reading the book for the whole night.
他整晚都继续读那本书。
Suddenly all the lights went on.
突然所有的灯都亮了。
As time goes on, we will understand the importance of health.
随着时间的流逝，我们会明白健康的重要性。
What's going on here
这里发生了什么事
[即学即用]
雨持续了好几个小时。
The rain _______ _______ for hours.
went on
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。
[用法讲解]表示分数时，用基数词表示分子，序数词表示分母。当分子大于1时，分母的序数词用复数。
Eg: one third三分之一;two sixths六分之二;
注意:分数作主语时，谓语动词在数上与分数后的名词保持一致。
Eg: One third of the students go to school by bus.
三分之一的学生坐公交车上学。
Two fifths of the land is covered with snow.
五分之二的土地被大雪覆盖。
[即学即用]
( )In our class ______ of the students _____ girls.
A.third fifths; is B. third fifth; are
C. three fifth; is D.three fifths; are
D
10.Which word can we use to replace the word “trap” 我们可以用哪个词替换“trap"
[用法讲解] replace在此处为动词，译为“代替、取代”。
Eg: Nothing can replace the love of a mother.
没有什么能取代母爱。
I need to replace the battery in my watch.
我需要更换手表里的电池。
[常见搭配]replace A with B用B替换A
be replaced by...被...取代
replace sb. as sth.接替某人担任...
Eg: The company decided to replace plastic packaging with recyclable materials.
公司决定用可回收材料替换塑料包装。
Traditional mail has been largely replaced by emails.
传统邮件已基本被电子邮件取代。
She will replace her father as the head of the family.
她将接替她父亲成为一家之主。
[派生词]replacement为名词，译为“替代、取代、替换物”。
Eg: The replacement of the old equipment took a long time.
更换旧设备花了很长时间。
[即学即用]
他们计划用节能灯取代传统灯。
They plan to _______ the traditional lights_______ energy - saving ones.
replace with
11.Welcome to Science with Doctor Ted.欢迎来到“泰德博士讲科学”。
[用法讲解] welcome在此处为动词，译为“欢迎”;welcome也可为名词，译为“欢迎”。
[常见搭配]welcome to +地点“欢迎来到某地”
give sb. a warm welcome“热烈欢迎某人”
You're welcome.不客气。
Eg: Welcome to Beijing.
欢迎来到北京。
The teahouse gave us a warm welcome.
这个茶馆热烈欢迎我们。
[即学即用]
欢迎来到我的家乡。
_______ ______ my hometown.
Welcome to
12.What's more, the ocean can take in25% - 30% of carbon dioxide and store heat.
此外，海洋能吸收25%到30%的二氧化碳，还能储存热量。
[用法讲解]“take in”译为“吸收、吸入、理解、领会、接纳”等。
Eg: Fish take in oxygen through their gills.
鱼用鳃吸取氧气。
Open the window and take in some fresh air.
打开窗户，呼吸一些新鲜空气。
It took me a while to take in what he was saying.
我花了一些时间才理解他说的话。
The club decided to take in more members this year.
俱乐部决定今年接纳更多会员。
[知识拓展]take down拆除、记录
take after(外貌或行为)像(父母)
take away拿走、拿开
take off脱掉、起飞
take up开始做、占据
[即学即用]
植物通过叶子吸收二氧化碳。
Plants______________carbon dioxide through their leaves.
take in
13.It's time for us to take action and protect the ocean.我们是时候采取行动保护海洋了。
[用法讲解]time作不可数名词时，译为“时间”;time作可数名词时，译为“次数”;time在表示“倍数”时，常以复数形式出现。
Eg: We spend lots of time playing basketball.
我们花了很多时间打篮球。
I have been to Beijing three times.
我已经去北京三次了。
He is three times taller than me.
他比我高三倍。
[常见搭配]a time to do sth.一个做某事的时间
It's time for sth. = It's time to do sth.到了做某事的时候
What time is it = What's the time 几点了
at the time当时
three times 三次
all the time一直
at the same time同时
on time准时
in time及时
ahead of time提前
Eg: He found a time to talk to her.
他找到了一个时间和她说话。
It's time for dinner.= It's time to have dinner.
到了吃晚饭的时候了。
It seemed like a good idea at the time.
当时这注意好像不错。
You can't be with your baby all the time.
你不能总守在你的宝宝身边。
All the boats and carts started off at the same time.
车船齐发。
The bus came right on time.
公共汽车正好准时到达。
I hope we get there in time.
我希望我们及时到达那里。
We finished 15 minutes ahead of time.
我们提前15分钟完成。
[即学即用]
( )It is time _______the chains of life.
A.break B. to break C. breakingD. for breaking
B
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Unit 7 The natural world 课文解析一
1.Half of the world's animals and plants live in rainforests.
世界上一半的动植物生活在雨林中。
[用法讲解] half在此处为名词，译为“一半”，其复数形式为halves;half还可为形容词，译为“一半的”;half亦可为代词，译为“一半”。
Eg: Half of the students in the class are girls.
班上一半的学生是女生。
She spent half the day reading.
她花了大半天时间读书。
I gave her half and kept half for myself.
我给了她一半，自己留了一半。
[常见搭配] half of...一半的...(作主语时，谓语动词由后面名词决定)
go halves (with sb.)和某人平摊
half past ... …半
Eg: Half of the books have been placed on the shelves.
一半的书被放在架子上。
Half of the water is polluted.
一半的水被污染了。
We have to go halves on the phone bill.
我们得平摊电话费。
It's half past twelve now.
现在十二点半。
[即学即用]
Half of the students _______ (be) absent today because of heavy rain.
答案: are
2.Coral reefs look like rocks, but they support a lot of life in just a small area.
珊瑚礁看起来像岩石，但它们在一小块区域内维系着大量生命。
[用法讲解] support在此处为动词，译为“维持、养活、支持、拥护”;support也可为不可数名词，译为“支持”。
Eg: The environment of Mars could not support life.
火星的环境无法维持生命。
This land can't support many cows.
这块土地养了许多牛。
I hope you can support me in this.
我希望你能在这一点上支持我。
The project received financial support from the government.
这个项目得到了政府的财政支持。
[常见搭配] support sb. in doing sth. 支持某人作某事
with/ without one's support 在/没有某人的支持下
in support of sb./ sth. 支持某人/某事
Eg: My parents support me in pursuing my dream.
我的父母支持我追求我的梦想。
We couldn't win the match without your support.
没有你们的支持我们赢不了这场比赛。
She spoke in support of Tom's plan.
她发言支持汤姆的计划。
[派生词] supporter为名词，译为“支持者”;
supportive为形容词，译为“支持的、给予帮助的”。
Eg: She was a supporter of the free market economy.
她是自由市场经济的支持者。
The silent majority of supportive parents and teachers should make their views known.
表示支持的父母和老师是沉默的大多数，他们应该公开表达他们的观点。
[即学即用]
他们举行集会支持新政策。
They held a rally _______ ________ ______ the new policy.
答案: in support of
3.Grasslands often lie between deserts and forests. 草原常位于沙漠和森林之间。
[用法讲解] lie在此处为动词，译为“位于”，也可译为“躺、说谎”。
注意:译为“位于、躺”时，其过去式为lay，过去分词为lain;译为“说谎”时，其过去式为lied，过去分词为lied。
Eg: Japan lies to the east of China.
日本位于中国的东面。
She lies on the sofa every afternoon.
她每天下午躺在沙发上。
He often lies about his work.
他经常谎报工作。
[常见搭配] lie to ...位于...(不接壤)
lie on... 位于...(接壤)
lie in... 位于...(范围内)
lie off... 位于...(隔一段距离)
lie to sb.多某人说谎
Eg: Russia lies on the north of China.
俄罗斯位于中国的北方。
Liaoning lies in the north of China.
辽宁位于中国被北方。
The island lies off the coast.
岛屿位于海岸外。
He often lies to his parents.
他经常对父母说谎。
[即学即用]
( )Beijing lies _______ the northwest of Shanghai.
A.to B.on C.in D.off
答案:A
4.The polar ice is home to animals like polar bears and penguins.
极地冰原是北极熊和企鹅等动物的家园。
[用法讲解] be home to译为“是...的栖息地/家园/所在地”。
Eg: The Amazon Rainforest is home to many unique species.
亚马孙雨林“是许多独特物种的栖息地。
[即学即用]
这个小镇是那位著名诗人的故乡。
This small town _______ ______ ______ the famous poet.
答案: is home to
5.The climate in deserts is so awful that only a few animals and plants can live there.
沙漠的气候非常恶劣，只有少数动植物能够在那里存活。
[用法讲解] “so ... that从句”，译为“如此...以至于...”，so是副词，后接形容词或副词，表示程度，that从句表示结果。
Eg: It was so cold outside that we had to stop the game.
外面天太冷了，我们不得不停止比赛。
[知识拓展]“such ... that从句”，译为“如此...以至于..”，such后需接名词(短语)。
“so + many/ much/ few/ little +名词 +that从句”译为“如此多/少...以至于..”。
Eg: She is such a good teacher that we all like her.
她是一位很优秀的老师，所以我们都喜欢她。
There are so many people in the hall that we can't find a seat.
大厅力有如此多的人以至于我们找不到座位。
[即学即用]
( ) Beijing has _______ many buses that there is often a traffic jam in rush hours.
A.so B.such C.too D.very
答案:A
6.Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment.
每个生态系统都要发挥作用，从而帮助保持其所有成员和更大的环境之间的平衡。
[用法讲解]“play a role in (doing)”译为“在...中起作用/扮演角色”。“play a role as...”译为“担任..的角色”。
Eg: Technology plays a role in modern education.
技术在现代教育中起作用。
He played a role as the team leader.
他担任了团队领导的角色。
She played a role in designing the logo.
她参与了标志的设计。
[即学即用]
阳光在光合作用中起作用。
Sunlight __________________ photosynthesis.
答案:plays a role in
7.It holds plenty of salt water, and the water rises to the sky, falls onto the lands and then returns to the ocean.它容纳大量海水，水分升上填空，落到陆地上，然后流回海洋。
[用法讲解]“plenty of...”后既可接可数名词复数，也可接不可数名词。
Eg: There are plenty of books in the library.
图书馆里有大量的书。
We have plenty of time to finish the work.
我们有大量的时间来完成这项工作。
[用法讲解]return在此处为动词，译为“返回、回来、归还”，return还可为名词，译为“返回、回来、恢复”。
Eg: He will return home tomorrow.
我明天会回家。
The patient is slowly returning to health.
病人正在逐渐恢复健康。
The return of the investment was very high.
这项投资的回报率很高。
[常见搭配] return sth. to sb./ sth.把某物归还给某人/某处
return to +地点 = go back to地点 回到某地
in return 作为回报(强调一种行为或态度的回应)
in return for ... 作为对...的回报(强调一种明确的、具体的交换关系)
Eg:I returned the book to the library.
我把书还给了图书馆。
They will return to the office after the meeting.
会议结束后，他们会返回办公室。
She helped me move, and I cooked dinner in return.
她帮我搬东西，作为回报我做晚饭。
He gave me a gift in return for my help.
他给了我一份礼物以报答我的帮助。
[易混辨析] rise, arise与raise区别:
rise (动词)“上升”表示由低到高的变化过程，强调主语自身移向较高位置。
arise (动词)“起身”主语发出的动作，作用到其它事物。
raise (动词)“举起”表示把具体事物举到高处。
Eg: The sun rises.
太阳升起来了。
He arises to greet her.
他起身向她问候。
He raises his hand to answer questions.
他举手回答问题。
[即学即用]
1.在会议开始前我们有大量的时间。
We have ________ _______ time before the meeting starts.
( )2. Last year the advertising rate _______by 20 percent.
A.raised B. rose C. arose D. went down
( )3. I don't know when we will ______ Beijing.
A.return back B.return to
C. return back to D.return
答案: 1. plenty of 2.B 3.B
8.This goes on and on, so the ocean is just like the “heart”of the earth!
这个过程循环往复，所以海洋就如同地球之心。
[用法讲解]“go on”译为“(情况、形势)继续下去、持续、继续做某事、(灯)亮、通(电)、流逝、发生、进行”等。
Eg: We hope the nice weather will go on for the weekend picnic.
我们希望这样的好天气将持续到周末野餐的时候。
He went on reading the book for the whole night.
他整晚都继续读那本书。
Suddenly all the lights went on.
突然所有的灯都亮了。
As time goes on, we will understand the importance of health.
随着时间的流逝，我们会明白健康的重要性。
What's going on here
这里发生了什么事
[即学即用]
雨持续了好几个小时。
The rain _______ _______ for hours.
答案:went on
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。
[用法讲解]表示分数时，用基数词表示分子，序数词表示分母。当分子大于1时，分母的序数词用复数。
Eg: one third 三分之一; two sixths 六分之二;
注意:分数作主语时，谓语动词在数上与分数后的名词保持一致。
Eg: One third of the students go to school by bus.
三分之一的学生坐公交车上学。
Two fifths of the land is covered with snow.
五分之二的土地被大雪覆盖。
[即学即用]
( )In our class ______ of the students _____ girls.
A.third fifths; is B. third fifth; are
C. three fifth; is D.three fifths; are
答案:D
10.Which word can we use to replace the word “trap” 我们可以用哪个词替换“trap"
[用法讲解] replace在此处为动词，译为“代替、取代”。
Eg: Nothing can replace the love of a mother.
没有什么能取代母爱。
I need to replace the battery in my watch.
我需要更换手表里的电池。
[常见搭配] replace A with B 用B替换A
be replaced by...被...取代
replace sb. as sth.接替某人担任...
Eg: The company decided to replace plastic packaging with recyclable materials.
公司决定用可回收材料替换塑料包装。
Traditional mail has been largely replaced by emails.
传统邮件已基本被电子邮件取代。
She will replace her father as the head of the family.
她将接替她父亲成为一家之主。
[派生词]replacement为名词，译为“替代、取代、替换物”。
Eg: The replacement of the old equipment took a long time.
更换旧设备花了很长时间。
[即学即用]
他们计划用节能灯取代传统灯。
They plan to _______ the traditional lights_______ energy - saving ones.
答案:replace; with
11.Welcome to Science with Doctor Ted.欢迎来到“泰德博士讲科学”。
[用法讲解] welcome在此处为动词，译为“欢迎”;welcome也可为名词，译为“欢迎”。
[常见搭配]welcome to +地点“欢迎来到某地”
give sb. a warm welcome“热烈欢迎某人”
You're welcome. 不客气。
Eg: Welcome to Beijing.
欢迎来到北京。
The teahouse gave us a warm welcome.
这个茶馆热烈欢迎我们。
[即学即用]
欢迎来到我的家乡。
_______ ______ my hometown.
答案:Welcome to
12.What's more, the ocean can take in25% - 30% of carbon dioxide and store heat.
此外，海洋能吸收25%到30%的二氧化碳，还能储存热量。
[用法讲解]“take in”译为“吸收、吸入、理解、领会、接纳”等。
Eg: Fish take in oxygen through their gills.
鱼用鳃吸取氧气。
Open the window and take in some fresh air.
打开窗户，呼吸一些新鲜空气。
It took me a while to take in what he was saying.
我花了一些时间才理解他说的话。
The club decided to take in more members this year.
俱乐部决定今年接纳更多会员。
[知识拓展] take down 拆除、记录
take after (外貌或行为)像(父母)
take away 拿走、拿开
take off 脱掉、起飞
take up 开始做、占据
[即学即用]
植物通过叶子吸收二氧化碳。
Plants______________carbon dioxide through their leaves.
答案: take in
13.It's time for us to take action and protect the ocean.我们是时候采取行动保护海洋了。
[用法讲解] time作不可数名词时，译为“时间”;time作可数名词时，译为“次数”;time在表示“倍数”时，常以复数形式出现。
Eg: We spend lots of time playing basketball.
我们花了很多时间打篮球。
I have been to Beijing three times.
我已经去北京三次了。
He is three times taller than me.
他比我高三倍。
[常见搭配] a time to do sth.一个做某事的时间
It's time for sth. = It's time to do sth.到了做某事的时候
What time is it = What's the time 几点了
at the time 当时
three times 三次
all the time 一直
at the same time同时
on time 准时
in time 及时
ahead of time 提前
Eg: He found a time to talk to her.
他找到了一个时间和她说话。
It's time for dinner.= It's time to have dinner.
到了吃晚饭的时候了。
It seemed like a good idea at the time.
当时这注意好像不错。
You can't be with your baby all the time.
你不能总守在你的宝宝身边。
All the boats and carts started off at the same time.
车船齐发。
The bus came right on time.
公共汽车正好准时到达。
I hope we get there in time.
我希望我们及时到达那里。
We finished 15 minutes ahead of time.
我们提前15分钟完成。
[即学即用]
( )It is time _______the chains of life.
A.break B. to break C. breaking D. for breaking
答案:B
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