Unit5 Presenting ideas+Reflection 同步习题检测 2025-2026学年外研版英语八年级下册

Unit 5 Looking into nature Presenting ideas 同步习题 一、阅读理解 阅读下面短文，从每题所给的A、B、C、D四个选项中选出最佳选项。 For thousands of years, humans have explored the Earth. Nowadays, we are exploring space. Astronomers (天文学家) are the modern day explorers. Now, many astronomers are looking for new planets and new places for humans to live in the future. But where do astronomers start looking? First of all, astronomers look for a star. That's because our own Earth moves around a star (the Sun). More importantly, it is the correct distance from the Sun for heat and light. So when astronomers have found the star, they look at the planets around it. In recent years, astronomers have found nearly 400 new planets with stars. However, many of these planets are either too near the star or too far away. However, if the planet is in a good position, astronomers look for three key things: water, air and rock. Water is important because all life needs it. Humans can drink it and also grow plants with water. And plants produce air for humans to breathe and food to eat. Rock on a planet is also important. That's because there is often water under the rock. After many years of scrutinizing, astronomers have found a planet that is similar to the Earth. It's Gliese 581g and it's near a star. The astronomers think it has water and rock and the average (平均) temperature is between —31℃ and —12℃. That's cold, but not colder than Antarctica or the Arctic Circle. And Gliese 581g is bigger than the Earth. A year on Gliese 581g is only 37 Earth days instead of 365. But astronomers do not think these are big differences and some of them think Gliese 581g will be a new Earth. However, Gliese 581g is twenty light years from the Earth. ( )1. What do astronomers have to find first before starting to look for a new place for humans to live? A. A new star.　　B. A new planet. C. Some heat.　　D. Some light. ( )2. Why is rock on a planet important? A. The star is in a right position. B. We may discover water under it. C. The planet is too near to the Sun. D. There can be air around the rock. ( )3. What does the underlined word “scrutinizing” mean in the last paragraph? A. Discussing.　　B. Waiting. C. Looking for.　　D. Travelling. ( )4. What's the main idea of the text? A. Gliese 581g is already a new Earth. B. There are planets similar to our Earth. C. Water, air and rock are important on the Earth. D. Astronomers are looking for a new Earth. 二、词汇运用 用括号内所给单词的适当形式填空，必要时可添加助动词。 Ocean 1. ______ (explore) has always been a journey filled with many mysteries and challenges. One of the biggest 2. ______ (achieve) in this field is the 3. ______ (discover) of hydrothermal vents (热液喷口) in the deep sea. Scientists once wondered whether life could exist in the dark, high-pressure environment of the deep ocean—if there was no sunlight, how could any creature survive? 4. ______ (find) the answer, they carried on with their risky journey: they designed submersibles (潜水器) that could stand extreme pressure, and spent years 5. ______ (dive) into the unknown depths. Finally, they found hydrothermal vents, where unique ecosystems live on 6. ______ (chemistry) energy instead of sunlight. This finding not only proved that life can exist in bad conditions than we imagined, but also made 7. ______ (we) rethink whether similar life might exist on other planets. Though the sea still holds many 8. ______ (secret), this exploration 9. ______ (show) that as long as we carry on with our efforts, we can unlock the 10. ______ (end) wonders of nature—no matter what challenges lie ahead.   Reflection—回归教材 一、根据汉语提示，用单词的正确形式填空。 Secrets caught in time Imagine a 1. ______ (恐龙) in an ancient forest. It is running around looking for its next meal. With an angry cry, it opens its mouth, raises its beautiful 2. ______ (羽毛覆盖的) arms, and … Wait, feathers on a dinosaur? For hundreds of years, people believed that dinosaurs looked like huge lizards. Just look at all those dinosaurs in books, films and TV shows! However, thanks to a piece of amber, scientists now know that this idea is wrong. In the amber from Southeast Asia, they found the tail of a dinosaur—with feathers. These beautiful golden stones quietly keep pieces of the past. They can tell us 3. ______ (是否) dinosaurs had feathers, but that's not all. They also help us understand that life on earth has always changed. A piece of amber from 4. ______ (北部的) Europe, for example, holds a flower. This 5. ______ (物种) no longer grows in this area. But the find proves that it did 35 million years ago. In the future, amber may also help us discover if other species have changed over time. Thanks to amber, more than 300 6. ______ (未知的) species have been discovered. In a piece of amber from Africa, scientists found 13 ants. Research shows that they are a completely new species. Scientists used to believe that ants came from the northern half of the earth. The discovery of this 7. ______ (非洲的) species has changed old 8. ______ (观点) about the history of ants. Who knows whether this piece of amber will tell us more secrets? As a window on the past, amber has been much studied. However, it's still not 9. ______ (完全地) understood. We should put more effort into research. Then we can use this key to 10. ______ (解锁) more secrets of nature. 二、词汇运用 用括号内所给单词的适当形式填空，必要时可添加助动词。 Plants for life Nature presents us with 1. ______ (end) wonders. Most people get 2. ______ (interest) and ask questions. But one person took his interest all the way to the fields. He was born in the flowering season of early summer, and made plants his life. For over 70 years, he explored China to study the 3. ______ (country) plants. This person was Wang Wencai. Throughout his life, Professor Wang worked hard to research the world of plants in China. He discovered and named about 1,370 new plant species. To carry out his research, he spent years in wild mountains and forests. Once, he fell 4. ______ (serious) ill while doing field work in Yunnan. Though he nearly died, Wang never stopped his work. He lost sight in his right eye at the age of 83. But he didn't let 5. ______ (somebody) know. With a magnifier in hand, he still carried on with his research for another 10 years. Despite his huge success, Wang seldom thought about personal honour or 6. ______ (wealthy). Although he received the First Class Award of National Natural Science Awards twice, he hardly mentioned it. For him, the award 7. ______ (belong) to the team, and he was just doing his job. In fact, Wang was always quiet about his 8. ______ (achieve). He was such a great scientist. But for a long time, even his granddaughter had no idea. Plants grow and sleep with the seasons. So did Professor Wang. He passed away at the age of 96 with the 9. ______ (fall) leaves of autumn. When people came to say goodbye, they didn't hear any sad notes. Instead, they got to listen to Beethoven's Pastoral Symphony. This was Wang's favourite piece of music. It 10. ______ (soft) told people about his lifelong exploration and love of nature. 答案 Presenting ideas 一、1—4 ABCD 二、1. exploration 2. achievements 3. discovery 4. To find 5. diving 6. chemical 7. us 8. secrets 9. shows 10. endless Reflection—回归教材 一、1. dinosaur 2. feather-covered 3. whether 4. northern 5. species 6. unknown 7. African 8. beliefs 9. fully 10. unlock 二、1. endless 2. interested 3. country's 4. seriously 5. anybody 6. wealth 7. belonged 7. achievements 9. falling 10. softly 学科网（北京）股份有限公司 $