《2025年聪明屋寒暑假作业系列丛书暑假作业七年级广西专版》

Ⅱ. Learn more about animals.
圈养让很多生活在动物园里的动物渐渐丧失了它们的一些天性。而生活在极端环境下的动物,它们又在经受着怎样的考验呢？

答案： 【解析】：
这是一个阅读理解或者材料分析题，主要考查学生对动物生活习性和环境适应性的理解。题目提到的“圈养让很多生活在动物园里的动物渐渐丧失了它们的一些天性”，这涉及到动物行为学以及环境对动物行为的影响。另外，“生活在极端环境下的动物，它们又在经受着怎样的考验呢？”这部分则更深入地探讨了动物如何适应极端环境的问题。
【答案】：
1. 圈养环境对动物天性的影响：圈养环境通常限制了动物的活动范围，这可能导致动物逐渐丧失一些自然行为，如迁徙、狩猎等。长期圈养还可能影响动物的社交行为和繁殖能力。
2. 极端环境下动物的考验：生活在极端环境下的动物，如沙漠、北极或高山地区的动物，需要面对极端的气候条件、食物短缺等挑战。这些动物通常具有特殊的生理结构和行为适应机制，以帮助它们在恶劣环境中生存。
由于本题未给出具体的问答或选择项，所以答案以开放性的形式给出，主要围绕题目中提到的两个核心点进行阐述。

A
The polar bear(北极熊) is a kind of big and white bear. We call it the polar bear because it lives inside the Arctic Circle(北极圈). There are no polar bears in the Antarctic Circle(南极圈).
In the Arctic Circle, there is only snow, ice and water. You can hardly(几乎不) see the polar bear in the snow because its coat is nearly white. It has a very warm coat because the weather is cold in there.
Usually, the polar bear is about 3 metres long, and weighs about 450 kilograms. It can stand up on its back legs because it has very wide feet. It can use its front legs like arms. The polar bear can swim very well. It can swim 10 km/h. It catches fish and other sea animals as food. It goes into the sea when it is afraid.
Some people kill the polar bear for its beautiful white coat, and the climate change also undermines(破坏)their living environment(生存环境). Now more and more people are calling for protection of polar bear. They do not want all of these beautiful animals to die.
根据短文内容回答以下问题。
1. Where does the polar bear live?______
2. Are there any polar bears in the Antarctic Circle?______
3. Why can people hardly see the polar bear in the snow?______
4. What does the polar bear catch for food?______
5. Why do people kill the polar bear?
______

答案： 1.It lives inside the Arctic Circle. 2.No, there aren't. 3.Because its coat is nearly white. 4.Fish and other sea animals. 5.Because they want its beautiful white coat.

B
The salmon(大马哈鱼) is a very strange fish. It was born in the river. But the young salmon swims down the rivers towards the Pacific Ocean. And it lives in the sea and becomes full grown. Then it returns to the river where it was born.
A grown - up salmon weighs about 3.5 kilograms. The female(雌性)salmon will not spawn(产卵) in the Pacific Ocean. When it is almost time to lay them, both male(雄性) and female salmon begin a long journey. Each salmon is heading for the river where it was born. A salmon may be in a thousand miles away from where its life began, yet it is able to return to that place.
As the salmons swim, larger fish may attack(袭击) them. The salmons would be food for some other larger fish or be caught by fishermen. The rest of(剩下的)the salmons keep swimming.
After they enter the rivers, they head upstream(向上游). If rocks and waterfalls(瀑布) are in their way, the salmons leap(跃) over them. They leap by swimming at full speed under water. Almost the whole body of a salmon is made of muscles(肌肉). These powerful muscles make the salmon fit for fast swimming, turning quickly, and leaping high out of the water.
Some reach their rivers in summer, others in the early autumn. They have swum for hundreds, even thousands of miles and it has taken them weeks and months.
根据短文内容,判断句子正(T)误(F)。
( )6. The young salmon was born in the river and grows up in the sea.
( )7. A grown - up salmon's weight is about 3 kilograms.
( )8. Each salmon always takes a long journey during its life.
( )9. The female salmon will spawn in the Pacific Ocean.
( )10. Some larger fish like eating salmons.

答案： 6.T 7.F 8.T 9.F 10.T