Unit 4 Amazing plants and animals 单元测试 B卷2026-2027学年人教版英语八年级上册

Unit 4 Amazing plants and animals B卷

(时间:120分钟　满分:120分)

第一部分　听力理解 (20小题，每小题1分，共20分)

第一节：听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳答案。每段对话读两遍。

1. What does the man say about the octopus?
A. It has three hearts. B. It can change its color. C. It lives in deep sea.

2. What is the fastest fish in the ocean?
A. The sailfish. B. The shark. C. The tuna.

3. How does the pitcher plant attract insects?
A. With bright colors and sweet smell. B. With loud sounds. C. By moving its leaves.

4. What does the woman think of the cactus?
A. It’s ugly. B. It’s amazing for surviving in deserts. C. It’s too dangerous to touch.

5. Why are coral reefs important?
A. They are beautiful. B. They are home to many sea creatures. C. They produce oxygen.

第二节：听下面几段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳答案。每段对话或独白读两遍。

听下面一段对话，回答第6至第7两个小题。

6. How many legs does a spider have?
A. Six. B. Eight. C. Ten.

7. What does the man say about spiders?
A. They are all dangerous. B. They help control insect populations. C. They live in water.

听下面一段对话，回答第8至第9两个小题。

8. What plant are they discussing?
A. The lotus. B. The bamboo. C. The orchid.

9. What is special about this plant?
A. It can grow in water. B. It blooms only at night. C. It is the fastest-growing plant.

听下面一段独白，回答第10至第12三个小题。

10. What animal is the speaker describing?
A. The chameleon. B. The lizard. C. The snake.

11. How does this animal catch its prey?
A. By using its long tongue. B. By running fast. C. By changing color.

12. What is one of its defense mechanisms?
A. Playing dead. B. Changing color to blend in. C. Making loud noises.

听下面一段对话，回答第13至第15三个小题。

13. What is the woman’s main concern about the rainforest?
A. It’s too hot. B. Many species are losing their habitat. C. It is difficult to travel through.

14. What percentage of Earth’s species live in rainforests?
A. About 30%. B. Over 50%. C. About 70%.

15. What does the man suggest they do?
A. Donate money to protect rainforests. B. Stop using paper. C. Plant more trees.

第三节：听下面一篇短文。按照你所听内容的先后顺序将下列图片排序。短文读两遍。

A. 鲸鲨游泳   B. 热带兰花盛开   C. 变色龙变色   D. 捕蝇草捕虫   E. 海豚跳跃
16. ______   17. ______   18. ______   19. ______   20. ______

第二部分　阅读理解 (20小题，每小题2分，共40分)

阅读下面四篇语言材料，然后按文后要求做题。

A

The Rafflesia – The World’s Largest Flower

Deep in the rainforests of Southeast Asia grows a strange and incredible plant called Rafflesia. It produces the largest single flower on Earth – up to one meter across and weighing as much as 10 kilograms. But this giant flower has no leaves, stems, or roots. It lives as a parasite inside a host vine.

The Rafflesia flower is not only huge but also smells terrible. It gives off a smell like rotting meat. This smell attracts flies and beetles, which help pollinate the flower. The flower blooms for only about 5 to 7 days. After that, it wilts and dies.

Because Rafflesia depends on a specific host vine, it is very sensitive to deforestation. When the host vines are cut down, Rafflesia cannot survive. Scientists estimate that some species of Rafflesia are critically endangered, with only a few hundred individuals left.

Despite its unpleasant smell, Rafflesia is a wonder of nature. It shows how plants can evolve in extraordinary ways to survive. Researchers are working to protect its habitat and better understand its life cycle.

21. Where does the Rafflesia grow?
A. In African deserts. B. In Southeast Asian rainforests. C. In North American grasslands. D. In European gardens.

22. How long does the Rafflesia flower last?
A. 1 to 2 days. B. 3 to 4 days. C. 5 to 7 days. D. 10 to 14 days.

23. Why does the Rafflesia smell like rotting meat?
A. To scare away animals. B. To attract insects for pollination. C. To protect itself from disease. D. To store water.

24. What makes Rafflesia endangered?
A. It is eaten by animals. B. Its host vines are being destroyed. C. It cannot reproduce. D. The flowers are picked by people.

25. What is the main idea of the passage?
A. Rafflesia is the smelliest flower. B. Rafflesia is a unique but threatened plant. C. Rafflesia has no leaves or roots. D. Rafflesia is only found in zoos.

B

The Immortal Jellyfish – A Creature That Cheats Death

Imagine a creature that can live forever. It sounds like science fiction, but the Turritopsis dohrnii, also known as the “immortal jellyfish,” can actually reverse its life cycle. When it is injured, sick, or old, it can transform back into a young polyp – the earliest stage of its life. Then it can grow up again. This process can repeat indefinitely.

How does it do this? The jellyfish has special cells that can change from one type to another, a process called transdifferentiation. This allows it to rebuild its body. Scientists are studying this ability to learn more about human aging and diseases like cancer.

However, this jellyfish is not truly immortal in the wild. It can still be eaten by predators or killed by disease. Also, its ability to reverse aging has only been observed in the laboratory.

Despite its name, the immortal jellyfish is tiny – only about 4.5 millimeters across. It is found in oceans all over the world, but it originally comes from the Caribbean Sea. This tiny creature reminds us that nature is full of surprises.

26. What is special about the immortal jellyfish?
A. It can live in fresh water. B. It can reverse its life cycle. C. It glows in the dark. D. It has no brain.

27. What is transdifferentiation?
A. The ability to change color. B. The process of cells changing from one type to another. C. The ability to regenerate lost parts. D. The process of growing larger.

28. How big is the immortal jellyfish?
A. About 4.5 centimeters. B. About 4.5 millimeters. C. About 45 millimeters. D. About 45 centimeters.

29. Where did the immortal jellyfish originally come from?
A. The Pacific Ocean. B. The Atlantic Ocean. C. The Caribbean Sea. D. The Mediterranean Sea.

30. What does the writer imply about the jellyfish’s immortality?
A. It can never die. B. It can avoid death, but it’s not invincible. C. It only lives in laboratories. D. Its ability is not useful to humans.

C

① Have you ever seen a plant that can move quickly? Most plants are slow growers, but the telegraph plant (or Semaphore plant) is different. Its small side leaflets can move up and down in a few seconds, almost like a telegraph machine sending signals.

② The telegraph plant is native to Asia. Its leaves move in response to changes in light, temperature, and even sound. Scientists think this movement helps the plant avoid too much sunlight or protect itself from wind.

③ Another amazing plant is the Mimosa pudica, which folds its leaves when touched. But the telegraph plant’s movement is different — it is rhythmic and can continue for hours.

④ The telegraph plant also has bright yellow flowers and is used as a natural medicine in some cultures. However, it is also considered a weed in many agricultural areas.

⑤ This plant reminds us that plants are not as passive as they seem. They have sophisticated ways to interact with their environment.

31. What makes the telegraph plant special?
A. It can move its side leaflets quickly. B. It can grow very tall. C. It produces sweet fruit. D. It can eat insects.

32. What causes the telegraph plant to move?
A. Touch. B. Light, temperature, and sound. C. Insect attacks. D. Water shortage.

33. Which plant is mentioned as another fast-moving plant?
A. The Venus flytrap. B. The Mimosa pudica. C. The Rafflesia. D. The cactus.

34. What does the writer say about the telegraph plant’s use?
A. It is used as medicine in some cultures. B. It is only used for decoration. C. It is a major food source. D. It is harmful to humans.