资源简介

(共17张PPT)
Unit 5　Looking into nature
Period 3　Developing ideas I:Listening and speaking
02
能力提升练
01
基础达标练
一、根据汉语、音标或首字母提示,用单词的适当形式填空。
1.Be careful! The 　　　　　　/ b l / water will hurt you.
2.It’s important to read labels before using 　　　　　　/ kem k l/ to avoid accidents.
3.Gold doesn’t 　　　　　　/ri kt/ with oxygen, so it can stay shiny for a long time.
4.You can 　　　　　　(上传) your homework to the school system before 8 p.m.
boiling
chemicals
react
upload
5.Look at that model of the solar system. The Earth is just one of the
p　　　　　　 in it.
lanets
二、语音重读练习,根据提示内容填空。
6.单词 “produce” 有两种发音:/ pr dju s/ 和 /pr dju s/。
当发音为 / pr dju s/ 时,词性是　　　　　　,含义为 “产品;农产品”;
当发音为 /pr dju s/ 时,词性是　　　　　　,含义为 “生产;制造”。
7.单词 “desert” 的两种发音对应不同词性:
/ dez t/ 对应的词性是　　　　　　,含义为 “沙漠;荒漠”;
/d z t/ 对应的词性是　　　　　　,含义为 “舍弃(某地);遗弃(某人)”。
名词
动词
名词
动词
8.判断句子中“perfect”的重音位置和词性:
“It was a perfect day for a picnic.”
句中“perfect”的重音在第　　　　　 　 (一 / 二)个音节,词性是
　　　　　　。
一
形容词
三、根据中文提示完成句子,每空一词。
9.我们正在实验室外等待科学家们开始实验。
We are 　　　　　 　　　　　the scientists to start the experiment outside the lab.
10.许多天文学家正在研究黑洞是如何形成的。
Many astronomers are studying how 　　　　 　　　　are formed.
waiting for
black holes
11.没有人确切知道宇宙的起源是在什么时候。
No one knows exactly when ________ ___________ _________ ________
　　　　　was.
12.那些奇怪的自然奥秘激发了我们的好奇心。
Those strange natural secrets 　　　　 　 　 　　 　 　　　.
13.专家们正在讨论这次事故可能的原因。
Experts are discussing 　　　 　 　　　 　 　　　　　for the accident.
the beginning of the
universe
awaken/awakened our curiosity
the possible reasons
四、完形填空。(★★★,建议用时:6 分钟)
Today our class visited the Museum of Natural History. We went to see the new dinosaur show. At first I wasn’t 　14　 in seeing the dinosaur skeleton (骨架). Why would anyone want to learn about something that’s not around any more
(　　)14.A.busy B.weak C.interested D.successful
C
First we walked into a big room. I saw the skeleton of a 15 animal. Two huge, dark holes in its head looked back at me. It was Dinosaur Sue.
(　　)15.A.small B.cute C.large D.fat
C
Our guide told us all about Sue.It is the most complete skeleton of a T.rex (霸王龙) known to man. On a hot summer day in 1990, a girl named Susan from an archaeological (考古学的) team 　16　 a piece of the skeleton by accident. Later, her team dug day and night for 17 days. 17 ,
they found nearly a whole dinosaur skeleton under the earth.
(　　)16.A.afforded B.found C.proved D.tested
(　　)17.A.Nearly B.Simply C.Suddenly D.Finally
B
D
Then the guide told us to look at Sue’s　18　. Sue had 60 of them. They were just like knives that could cut other animals into parts. As I looked at it, I 　19　 what Sue looked like when it was alive. No one knows what 　20　 dinosaurs were, but I pictured it as brown and grey. I could see it going through the forest 　21　 food.
(　　)18.A.teeth　 B.legs C.tails D.feet
(　　)19.A.provided B.believed C.suggested D.wondered
(　　)20.A.weight B.shape C.colour D.age
(　　)21.A.giving up B.handing in C.comparing withD.searching for
A
D
C
D
Suddenly I realised that the skeleton was once a living animal on the earth. It made me think about other 　22　 that had once lived here. Now I 　23　 why people want to learn about these animals. It would be very exciting to find a dinosaur skeleton.
(　　)22.A.students B.animals C.museums D.plants
(　　)23.A.decide B.ask C.understand D.explain
B
C
五、回答问题。(★★★,建议用时:5 分钟)
There are billions of stars and planets in the universe. What’s the difference between stars and planets Stars can give out heat and light, but planets cannot.
The sun is one of the stars. Some planets are balls of rock and some are balls of gas. We live on the planet, the Earth. The Earth spins (自转) around once every day to give us day and night. It goes around the sun once every year to give us different seasons.
There are eight planets moving around the sun. We call the sun and its planets the solar system. Mercury is the nearest to the sun, so it is very hot. It is the smallest planet.Venus is very bright and hot. It is the nearest to the Earth. Mars is covered with orange-red dust and rocks, so it looks like a red star in the sky. It has seasons like the Earth. Jupiter has about 92 moons (卫星) and it is the biggest and heaviest planet. Saturn has about 274 moons. The other planets such as Uranus and Neptune, are all very far from the sun and very cold. We need a telescope (望远镜) to see them.
24.What can give out heat and light in the universe

25.What’s the result of the Earth going around the sun once every year

26.What’s the name of the sun and its planets

27.Which planet has seasons like the Earth, Mars or Venus

28.How many moons does Saturn have

Stars./Stars can give out heat and light in the universe.
It gives us different seasons.
The solar system.
Mars./Mars has seasons like the Earth.
It has about 274 moons.(共17张PPT)
Unit 5　Looking into nature
Period 4　Developing ideas II:Reading for writing
& Presenting ideas
02
能力提升练
01
基础达标练
一、根据首字母、音标或汉语提示,用单词的适当形式填空。
1.The old song brings back 　　　　　　/ endl s/ feelings of my hometown.
2.Each c　　　　　　 has its own unique culture and traditions.
3.Poor s　　　　　　 may cause difficulties in studying for some students.
4.Is there 　　　　　　(任何人) who can solve this difficult math problem
endless
ountry
ight
anybody
5.With the help of a 　　　　　 　/ m ɡn fa /, we can observe the small details of the insect.
magnifier
二、单项填空。
(　　)6.She said 　　　　the ancient coins were found in this village.
A.that B.if　 C.whether
(　　)7.I wonder 　　　　we can visit the science museum tomorrow.
A.that B.what　 C.if　
(　　)8.He asked 　　　　the meeting would start or not.
A.if B.whether C.that　
A
C
B
(　　)9.The teacher 　　　　us that we should finish our homework on time.
A.tells B.believes C.wonders D.asks
(　　)10.I 　　　　if she will come to the party this evening.
A.believe B.wonder C.tell D.prove
A
B
三、根据中文提示完成句子,每空一词。
11.这位老科学家多年来一直继续进行他的自然研究。
The old scientist has 　　　　　　 　　　　　　 　　　　　　his nature research for years.
12.终身探索能让我们不断了解世界的奇观。
　　　　　　 　　　　　　can allow us to keep learning about the wonders of the world.
carried on with
Lifelong exploration
13.他对自然的热爱让他在野外工作时充满动力。
His 　　　　　 　　　　　 　　　　　　keeps him motivated while working in the wild.
14.科学家们一直努力探索自然,希望揭开更多自然的秘密。
Scientists have been trying to ________ ________ __________, hoping to uncover more 　　　　　 　　　　　 　　　　　　.
15.去年,他们对十幅关于自然的海报进行了投票。
They 　　　　 　　　　　ten posters about nature last year.
love of nature
look into nature
secrets of nature
voted on
四、阅读理解(B篇)。(★★★,建议用时:5分钟)
It is hard to imagine a place that’s more dangerous than Death Valley. Death Valley is the hottest and driest place in North America.
Death Valley isn’t an easy place to live in. It gets less than two feet of rain a year and it’s hot, too. In July, the temperature in this place often reaches over 46℃. There is even a lake that has turned into salt crystals (晶体). But it is cold at night. When it gets cold enough, the water on the ground will turn into very thin ice. Then the strong wind—like a large hand—can move the rocks along the icy ground. That is why the rocks can “walk” on their own in Death Valley.
Although the weather in Death Valley is terrible, it is still filled with lives. Nothing can stop plants and animals from making it their home. People find more than 1,000 kinds of plants there. There are also 51 kinds of mammals (哺乳动物), 6 kinds of fishes, and more than 300 kinds of birds. The animals aren’t all small, either.
Finding water is the biggest challenge for anything that lives here. Some plants have roots that go fifty feet under the ground to find water. Kangaroo rats get the water they need from flowers. Death Valley really creates a lot of surprises!
(　　)16.Death Valley gets 　　　　of rain a year.
A.six feet B.fifty-one feet
C.at least two feet D.less than two feet
(　　)17.The underlined word “it” in Paragraph 3 refers to (指代)
“　　　　”.
A.the lake B.Death Valley
C.the strong wind D.the weather
D
B
(　　)18.The most difficult thing to do in Death Valley is to find 　　 　.
A.water B.food C.animals D.plants
A
(　　)19.What can we learn from the passage
A.The writer dislikes Death Valley.
B.Some animals are large in Death Valley.
C.The plants in Death Valley do not have long roots.
D.The rocks in Death Valley sometimes move in the afternoon.
B
(　　)20.What is the best title for the passage
A.The Hard Life in Death Valley
B.A Popular Place—Death Valley
C.The Facts About Death Valley
D.Moving Rocks in Death Valley
C
五、短文填空。(★★★,建议用时:5分钟)
Scientists have long been exploring nature. Once, a group of students were researching dinosaur fossils. They got into a heated
21.　　　　　　 about a strange fossil. They wondered 22.　　　　　 it belonged to a new dinosaur species. Some held the belief that dinosaurs 23.　　　　　　 exist elsewhere, just like how feathers of ancient birds were discovered—those feathers helped prove 24.　　　 some dinosaurs evolved into (进化成为) birds.
whether that why model unlock finding may planet style belief argue alive
argument
whether
may
that
To make their ideas more 25.　 　 , they planned to build a model of a dinosaur. They hoped to 26.________ the mystery of dinosaur features.While creating the model, they discussed the 27.______ of the dinosaur’s body covering—was it covered with scales (鳞片) or feathers
alive
unlock
style
After days of work, their 28.________ showed the model looked quite alive. When they presented it at school, others showed great interest. Their teacher said such exploration matches the scientific 29.　　　　 of studying nature. Through this, the students learned that to understand nature, we should keep questioning and trying, never allowing a fixed
30.　　　　 to limit our curiosity. And that’s how we truly connect with the amazing world around us.
finding
belief　
model(共17张PPT)
Unit 5　Looking into nature
Period 1　Starting out & Understanding ideas I:Reading
02
能力提升练
01
基础达标练
一、根据汉语、音标或首字母提示,用单词的适当形式填空。
1.Scientists wonder 　　　　　　(是否) other planets have life.
2.Experts had an 　　　 　　　/ ɑ ɡj m nt/ about the origin of the species in the amber.
3.Recent 　　　　　　(发现) in amber research have changed old beliefs about dinosaurs.
4.Last Sunday, a big traffic accident happened near our house, but the cause remains 　　　　　 　(未知的).
5.The scientist is trying to u　　　　　　 the secrets of the universe.
whether
argument
findings
unknown
nlock
二、单项填空。
(　　)6.　　　　 the ancient amber, we now know dinosaurs had feathers.
A.Because　　 B.Thanks to　　 C.Instead of　　 D.As for
(　　)7.People 　　　　believe that the earth was flat until scientific evidence proved it wrong.
A.used to　　 B.are used to　　 C.get used to　　 D.be used to
B
A
(　　)8.The amber specimen (样本) was 　　　　kept in the rock for over 99 million years.
A.perfectly　　 B.hardly　　 C.nearly　　 D.badly
(　　)9.We still have many 　　　　about the deep ocean—no one has explored most of it.
A.rules　　 B.stories　　 C.plans　　 D.secrets
A
D
三、根据中文提示完成句子,每空一词。
10.长久以来,人们认为恐龙生活在温暖湿润的森林里。
For a long time, people believed 　　　　dinosaurs _________ ________　　　　　　　　　　　　warm and wet forests.
11.这些封存着远古生物的琥珀,默默记录着地球的历史。
These pieces of amber with ancient creatures inside _________ ________
　　　　　 　　　　 　the earth’s history silently.
that
lived in
keep a
record of
12.随着科学的发展,我们不再怀疑鸟类与恐龙有密切关系。
With the development of science, we 　　　　　 　　　　　doubt that birds are closely related to dinosaurs.
no longer
四、阅读理解(A篇)。(★★☆,建议用时: 5分钟)
Amber Discovery Exhibition: Explore the Secrets of Ancient Nature
This exhibition presents the latest achievements in global amber research, showing precious amber specimens and their scientific discoveries. It’s a good chance for students and science lovers to learn about prehistoric (史前的) life and ancient ecosystems.
Key Exhibits & Discoveries
Region of Amber Core Discovery Research Value
The Baltic Region A well-preserved insect inside the amber, belonging to a species once thought extinct (已灭绝的) for millions of years Challenges the old timeline of species extinction
Southeast Asia Plant matter trapped in the amber, with clear structures visible under scans Holds clues (线索) to ancient climate conditions
Exhibition Information
Time: October 1-October 31, 2026 (9:00 am-5:00 pm, closed on Mondays)
Address: City Science and Technology Museum, 123 Science Avenue
Target Visitors: All ages (children under 12 must be accompanied by parents)
Special Experience: Use advanced 3D imaging equipment to observe amber internal structures for free.
Note: No photos allowed in the exhibition hall; explanatory materials are free to get at the entrance.
(　　)13.What is the purpose of the exhibition
A.To sell precious amber specimens.
B.To show the latest amber research results.
C.To teach people how to collect amber.
D.To introduce 3D imaging technology.
B
(　　)14.Where does the amber with the “once-extinct insect” come from
A.Southeast Asia. B.Africa.
C.The Baltic Region. D.South America.　
(　　)15.Who must be accompanied by parents when visiting the exhibition
A.Students under 16. B.Children under 12.
C.Teenagers aged 13-17. D.All visitors.
C
B
(　　)16.What can visitors do at the exhibition
A.Take photos of the amber specimens.
B.Get free explanatory materials.
C.Buy plant matter from Southeast Asia.
D.Visit it every Monday morning.　
(　　)17.What kind of text is this passage
A.A news report. B.A travel guide.
C.An exhibition notice. D.A science textbook.
B
C
五、配对阅读。(★★,建议用时: 4分钟)
左栏是关于自然探索的五个问题,右栏是七个解答。请将问题与解答匹配。
A.Yes! A piece of amber from Southeast Asia showed a dinosaur tail with feathers.Scientists now agree many dinosaurs had feathers. —Dr.Lee
B.Amber forms when tree resin hardens (树脂硬化) over millions of years.It often traps insects, plants, or small animals. —Science Museum
C.Scientists use fossils, amber, and even DNA from ancient remains. Special microscopes help them see tiny details of the species.
—Prof.Wang
D.Scientists found 13 new ant species in African amber. This changed ideas about where ants first appeared. —Nature Magazine
E.It helps us understand how life adapts to changes. For example, studying ancient species can teach us about climate change today.
—Dr.Chen
F.Most amber comes from pine trees. It takes at least 10 million years for resin to become amber. —Geology Guide
G.Dinosaurs without feathers were more common. Only small dinosaurs had feathers for warmth. —Zoo Expert
(　　)18.What is amber How does it form I saw a piece in a museum and want to know more! —Lily
(　　)19.Did dinosaurs really have feathers My little brother argues with me about it. —Tom
(　　)20.How do scientists study species that lived millions of years ago Are there any special tools —Lucy
(　　)21.I heard some ants in amber are new species.Where were they found —Mike
(　　)22.Why is studying ancient life important What can we learn from it —Anna
B
A
C
D
E(共17张PPT)
Unit 5　Looking into nature
单元巩固提升
02
课标主题阅读素养提升
01
基础知识巩固
一、语音练习:选出每组重音位置不同的一项。
(　　)1.A.nature　　　 B.explore　　　 C.secret　　　 D.different
(　　)2.A.science　　　B.believe　　　 C.ancient　　　 D.species
(　　)3.A.research　　 B.amber　　　　C.planet　　　 D.forest
(　　)4.A.achieve　　　B.agree　　　　 C.curious　　　 D.develop
(　　)5.A.unlock　　　B.discover　　 C.wonder　　　 D.explorer
B
B
A
C
C
二、词汇练习:用所给单词的适当形式填空。
6.Many 　　　　　　(explore) have devoted their lives to studying nature’s secrets.
7.The 　　　　 　　(discover) of the new plant species surprised all the scientists.
8.It’s 　　　　　　(amaze) that a small piece of amber can tell us so much about the past.
explorers
discovery
amazing
9.After years of hard work, they 　　　　　　(prove) that the theory was correct.
10.With great 　　　　　　(curious), the children asked many questions about dinosaurs.
proved
curiosity
三、句型练习:用that, if或whether将下列句子合并为含有宾语从句的复合句。
11.People thought.//Dinosaurs looked like huge lizards.

12.Did life on Earth change over time //We want to know.

People thought that dinosaurs looked like huge lizards.
We want to know if/whether life on Earth changed over time.
13.The amber holds a flower.//This shows.

14.Will scientists find more unknown species //Nobody is sure.

15.Wang Wencai discovered 1,370 new plant species.//We all know.

This shows that the amber holds a flower.
Nobody is sure if/whether scientists will find more unknown species.
We all know that Wang Wencai discovered 1,370 new plant species.
四、完形填空。(★★★,建议用时:6分钟)
范畴:人与自然　主题群:自然生态　子主题:热爱与敬畏自然
Last weekend, 12-year-old Leo helped his grandpa tidy up the backyard. While moving a wooden box, he noticed something interesting — a group of ladybugs on a sunflower leaf.
Leo stopped and 　16　 the ladybugs carefully. He saw they were eating small green bugs (小虫子) off the leaf. “Do they get rid of garden pests ” he asked his grandpa.Grandpa nodded, “They’re natural 　17　—gardeners love them!”
(　　)16.A.jumped　　 B.pointed　　 C.shouted D.watched　
(　　)17.A.helpers　　 B.teachers　　 C.learners　　D.readers　
D
A
With curiosity, Leo ran to get a magnifier. He 18 to watch the ladybugs. He saw that their red shells had black spots, and they moved
19 but steadily (稳步地). When a strong wind blew, some ladybugs fell off the 　20　, but they quickly stood and climbed back up.
(　　)18.A.sat　　 B.fell　　 C.put　　 D.turned　
(　　)19.A.luckily　　 B.kindly C.slowly　　 D.brightly
(　　)20.A.tree　　 B.leaf　　 C.jar　 D.glass　
A
C
B
Grandpa brought a small jar (罐子) and said, “Let’s pick up a few to 　21　 and then set them free.” Leo gently picked up two ladybugs and put them in the jar. He 　22　 their behaviors in a notebook: “They clean the leaf and help the sunflower grow.”
(　　)21.A.raise　　 B.see　　 C.study　 D.eat　
(　　)22.A.imagined　 B.drew　　 C.recorded　　 D.guessed　
C
C
After an hour, they let the ladybugs go. The little insects flew back to the sunflower at once. Leo smiled, “I never knew such 23 creatures could help so much!”
(　　)23.A.huge B.small C.busy D.powerful
B
That night, Leo searched online to 　24　 more about ladybugs. He learned they can live up to a year and lay hundreds of eggs. “Even tiny things have 　25　 jobs,” he told his mom.
Now, Leo checks the backyard every morning. He hopes to learn more about the small creatures there. “Exploring isn’t hard,” he thinks. “You just need to slow down and look closely.”
(　　)24.A.find out　　 B.look out　　C.take out　　 D.put out　
(　　)25.A.big　　 B.easy　　 C.boring　　 D.strong
A
A
五、 阅读填空(五选五)。(★★☆,建议用时:5分钟)
范畴:人与自然　主题群:自然生态　子主题:不同地区的生态特征与自然景观
Rocks are more than just hard objects under our feet. They are like “historical books” that record the Earth’s history. 26.　　　　 Over millions of years, layers of sand, mud, and minerals pile up and harden, keeping traces of ancient life and environments inside.
B
27.　　　　 For example, in the Gobi Desert, a rock layer held the fossil of a dinosaur egg. This helped scientists learn how dinosaurs laid and protected their eggs—something they didn’t know before!
Rocks also tell us about old climates. 28.　　　　 By studying the patterns of tree rings in fossilized wood inside rocks, we know that the area was once covered in forests, even though it’s a desert now.
D
A
29.　　　　 Thousands of ancient plant and animal fossils have been found in rocks, from tiny sea creatures to huge dinosaur bones. These finds show how life on the Earth evolved over time.
30.　　　　 It reminds us that Earth’s history is written in every rock, and exploring rocks can reveal (揭示) amazing facts about our planet’s past.
C
E
A.One rock from Antarctica has fossilized leaves of a warm-weather plant.
B.What makes rocks such good “history keepers”
C.Today, geologists (地
质学家) still study rocks to discover more of the Earth’s secrets.
D.Many clues about ancient life are hidden in rocks.
E.Rocks’ ability to “store” the Earth’s history makes them a treasure for science.(共15张PPT)
Unit 5　Looking into nature
Period 2　Understanding ideas II:Grammar
02
能力提升练
01
基础达标练
一、根据汉语、音标或首字母提示,用单词的适当形式填空。
1.The 　　　　　　(模型) of the building was made of card.
2.The sports meeting notice was put up on the school 　　　　　　/b d/ yesterday afternoon.
3.His words about seeing a bird in the park are t　　　. I saw it too.
4.The workers are c　　　　　　 the snow on the roads.
5.Blue w　　　　　　 are the largest animals on Earth and feed on tiny animals.
model
board
rue
learing
hales
二、语法点单句特训。
(　　)6. Our teacher said 　　　　amber can keep ancient creatures for millions of years.
A.that　　 B.if　　 C.whether
(　　)7. —Could you tell me 　　　　the scientists found the dinosaur feathers
—In a piece of amber from Southeast Asia.
A.when　　 B.where　　 C.why
A
B
(　　)8. I’m not sure 　　　　the flower in the amber still exists on Earth.
A.that　　 B.what　　 C.whether
(　　)9. The study proves 　　　　over 300 new species have been discovered in amber.
A.if　　 B.that　　 C.how
(　　)10. We need to discuss 　　　　to focus on amber or fossils for our research or not.
A.that　　 B.if　　 C.whether　
C
B
C
三、句型转换,每空一词。
11.People believed that dinosaurs had no feathers.(改为否定句)
People 　　　 　 　　 　　that dinosaurs 　　　　　feathers.
12.“Amber can unlock nature’s secrets,” the professor said.(改为含宾语从句的句子)
The professor said 　　　　　　amber 　　　　　　unlock nature’s secrets.
didn’t believe
had
that
can
13.Do other species change over time We want to discover.(合并为含宾语从句的句子)
We want to discover 　　　 　　　other species 　　　　　　over time.
14.Is the flower species still alive No one knows.(合并为含宾语从句的句子)
No one knows 　　　　　　the flower species 　　　　　　still alive.
whether/if
change
whether/if
is
15.“Amber can keep ancient creatures,” Lisa told her classmates.(改为含宾语从句的句子)
Lisa told her classmates 　　　　 　　　　 　　　　　　keep ancient creatures.

that amber can
四、语法选择。(★★☆,建议用时:4 分钟)
Last month, my class visited a science museum. There, we saw 　16　.
amazing amber exhibition. The guide told us 　17　 amber keeps ancient life forms safe for millions of years. Many students have never seen real amber before, so we all listened to the guide 　18　.
(　　)16.A.a B.an C.the
(　　)17.A.that B.what C.whether
(　　)18.A.care B.careful C.carefully
B
A
C
One display showed a piece of amber 　19　 a small insect inside. The guide said, “This insect died 50 million years ago, but its body is still in good shape.” I asked 　20　 we could take photos of it, but the guide said no—flashlights might damage the amber.
(　　)19.A.of B.with C.for
(　　)20.A.that B.how C.if
B
C
Then, we watched a video about amber research. Scientists have used 3D technology 　21　 amber since 2020. They 　22　 over 200 new species in amber so far. A researcher in the video said, “Amber is like a time capsule. It helps 　23　 understand how life on Earth changed.”
(　　)21.A.study B.to study C.studying
(　　)22.A.found B.will find C.have found
(　　)23.A.us B.we C.our
B
C
A
Before leaving, I bought a small amber key chain. It’s not a real ancient amber, 　24　 it reminds me of this interesting trip. I think everyone 　25　 visit such exhibitions because they can teach us a lot. Who knows Maybe one day, I will become a scientist studying amber too!
(　　)24.A.but B.and C.or
(　　)25.A.should B.must C.has to
A
A
五、短文填空。(★★★,建议用时:5 分钟)
Rocks are silent witnesses (目击者) that keep the stories of our planet. For centuries, people could not fully read the messages from the 26.　　　　　　 world hidden in them. But modern science has helped 27.　　　　　　 unlock their secrets—each layer of rock is like a page of history.
we prove high unlock believe that species ancient window teach from what
ancient
us
A rock sample from the Gobi Desert, for example, proves 28._____　　　　　　 there was a vast lake here 50 million years ago. The fossilized fish inside it 29.　　　　　 this fact beyond doubt. Another rock 30.　　　　 the Himalayas shows how the mountains have changed over millions of years. They have been rising higher and 31._________ from the earth.
that
proves
from
higher
Scientists say rocks are a 32.　　　　　　 to the past. So far, thousands of ancient 33.　　　　　　 of plants and animals have been discovered in rock layers. These discoveries not only help us understand how life developed but also 34.　　　　　　 us about the earth’s great changes. It is true that rocks are the key to 35.　　　　　 the mysteries of nature.
window
species
teach
unlocking

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