Unit 5 understanding ideas第二课时+同步作业 2025-2026学年外研版八年级英语下册

Unit 5 Understanding ideas Secrets caught in time 一、短语填空（共10分，每空1分） thanks to, no longer, change over time, put effort into, look for , be used to, used to, keep secret 1. Many old ideas about nature _______________ because of new discoveries. 2. _______________ amber, scientists have unlocked many secrets of the past. 3. He _______________ lives in the countryside; he moved to the city last year. 4. We should _______________ exploring the unknown world around us. 5. People _______________ think dinosaurs were just huge lizards. 6. This kind of tool _______________ digging out small things from old rocks. 7. Scientists often _______________ clues to ancient life in nature. 8. It’s polite to _______________ for your friends. 二、所给单词适当形式填空（每空2分，共16分） 1. The _______________ (north) part of China is cold and dry in winter. 2. This is an _______________ (know) species; no one has found it before. 3. We can _______________ (full) understand the past with the help of amber. 4. Many _______________ (Africa) ants have been found in amber. 5. He could _______________ (long) remember the old stories. 6. The story _______________ (catch) in amber surprises us all. 7. They have made many important _______________ (discover) recently. 8. Different people have different _______________ (believe) about nature .三、在空白处填入恰当的介词、冠词或连词，补全短文，每空限填1词。（每空2分，共18分） 1. Imagine a small animal ______ ancient forest. 2. People once believed ______ dinosaurs had no feathers. 3. We didn’t know the truth ______ amber was found. 4. This is ______ useful way to learn about history. 5. The tail ______ a dinosaur was kept well in amber. 6. Amber is a window ______ the past. 7. ______ more we study nature, ______ more we will learn. 8. Tell me ______ you want to explore in nature. 四、阅读理解（共30分，每小题2分） Passage 1 Amber is a hard yellow‑brown material made from resin(树脂) of ancient trees. It can keep small plants and animals very well for millions of years. Long ago, people thought amber was just a beautiful stone for jewelry. But now it is very important for scientists. It helps them unlock the secrets of ancient nature. In some amber, scientists found the tail of a dinosaur with feathers. It changed people’s old ideas. They used to think dinosaurs were just huge lizards without feathers. Now they know many dinosaurs had feathers. Scientists also found some ants in African amber. These ants were not known before. The discovery shows ants once lived in the southern part of the earth, not only in the north. Amber is like a window on the past. It helps us learn more about ancient plants, animals and the environment. The more we study amber, the more secrets we will find. 1. What is amber made from? A. Ancient trees B. Ancient animals C. Ancient rocks D. Ancient soil 2. What did people think of amber long ago? A. It was helpful for science. B. It was beautiful jewelry. C. It was a kind of food. D. It was useless for study. 3. The dinosaur tail in amber tells us ______. A. dinosaurs had feathers B. dinosaurs lived in trees C. dinosaurs were huge lizards D. dinosaurs liked eating plants 4. The ants in amber show ______. A. ants only lived in the north B. ants lived in the south too C. ants disappeared long ago D. ants were very small 5. What’s the main idea of the passage? A. How to make amber. B. Amber helps study ancient nature. C. All secrets of nature are known. D. Different kinds of amber.  Passage 2 Many years ago, people knew little about nature. With time going by, more scientists went out to explore the world. They discovered many amazing facts. Charles Darwin was a great British scientist. He spent years studying plants and animals. He visited many places and watched different living things. His studies helped people know how life changed over time. Li Shizhen was a famous doctor in Chinese history. He walked in mountains and fields. He studied thousands of plants and wrote a great book about medicine. Wang Zhenyi was a great female scientist. She studied the stars and math. She tried to explain natural facts to common people. These scientists all have one thing in common. They love nature and put much effort into studying it. They help us know the world better. 1. What does the first paragraph talk about? A. People knew much about nature before. B. Scientists help us know nature better. C. Exploring nature is very easy. D. Nobody likes studying nature. 2. Darwin mainly studied ______. A. stars and math B. plants and animals C. medicine D. history and geography 3. Li Shizhen wrote a great book about ______. A. medicine B. history C. sports D. art 4. What was Wang Zhenyi good at? A. Growing plants B. Drawing animals C. Studying stars and math D. Keeping animals 5. The three scientists all ______. A. lived in the same time B. loved and studied nature C. worked in foreign countries D. wrote many storybooks Passage 3 Do you want to look into nature? There are many fun and helpful ways. First, you can read books about nature. They tell stories of forests, rivers, animals and plants. You can learn many facts that you don’t know in class. Second, you can go outside to watch. Look at the trees, flowers and small animals. Take notes of what you see. You will find nature is full of surprises. Third, you can do small experiments. For example, you can grow a little plant and watch how it changes every day. It helps you learn life rules. Nature has endless secrets. We should keep curious and learn to explore. Every small step can help us know more about the world. 1. How many ways to learn nature are mentioned? A. Two B. Three C. Four D. Five 2. Reading books can help us ______. A. grow plants quickly B. learn facts about nature C. catch small animals D. make many friends 3. What can you do when you go outside to learn nature? A. Take notes of what you see. B. Cut down small trees. C. Play games with friends. D. Throw rubbish everywhere. 4. The writer thinks nature is ______. A. boring B. dangerous C. full of surprises D. difficult to understand 5. The passage mainly tells us ______. A. how to explore nature B. when to read books C. where to do experiments D. what to do in class 参考答案 一、短语填空 1. change over time 2. Thanks to 3. no longer 4. put effort into 5. used to 6. is used to 7. look for 8. keep secret 二、所给单词适当形式填空 1. northern 2. unknown 3. fully 4. African 5. longer 6. caught 7. discoveries 8. beliefs .三、在空白处填入恰当的介词、冠词或连词 1. in 2. that 3. until 4. a 5. of 6. to / on 7. The; the 8. what 四阅读理解 Passage 1 1. A 2. B 3. A 4. B 5. B Passage 2 1. B 2. B 3. A 4. C 5. B Passage 3 1. B 2. B 3. A 4. C 5. A 学科网（北京）股份有限公司 $