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 …