Unit 4 知识点 Section B 3a-3c 练习 2025-2026学年人教版八年级英语上册

八年级英语上册Unit4知识点-Section B 3a-3c练习 小试牛刀 A. 选用方框中的短语填空 | the largest and heaviest | as much as | live up to | some of the tiniest | a lively ecosystem | 1. The blue whale is ____________________ animal on earth. 2. It can weigh ____________________ 200 tons. 3. Blue whales eat ____________________ animals in the ocean. 4. They can ____________________ 90 years. 5. When a blue whale dies, it helps create ____________________ for many animals. B. 句型转换（改为一般疑问句并作肯定或否定回答） 1. The blue whale is the largest animal on earth. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 2. Blue whales eat around four tons of food a day. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 3. They live in all oceans except the Arctic Ocean. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 配套练习 A. 单项选择（★） 从A、B、C、D中选择最佳答案。 1. How much can a blue whale weigh? A. As much as 20 tons. B. As much as 200 tons. C. As much as 4 tons. D. As much as 90 tons. 2. Where do blue whales NOT live? A. The Atlantic Ocean. B. The Pacific Ocean. C. The Arctic Ocean. D. The Indian Ocean. 3. What do blue whales eat? A. Big fish. B. Small sharks. C. Some of the tiniest animals in the ocean. D. Seaweed. 4. How long can blue whales live? A. Up to 50 years. B. Up to 70 years. C. Up to 90 years. D. Up to 120 years. 5. Why is a dead blue whale important for the ecosystem? A. It becomes food for many animals and helps create a lively ecosystem. B. It pollutes the ocean. C. It scares other animals. D. It floats forever. B. 完成句子（★★） 根据课文内容，用正确的词汇完成句子。 1. 蓝鲸是地球上最大、最重的动物。 The blue whale is the __________ and __________ animal on earth. 2. 许多人喜欢看蓝鲸游泳，认为这是最美丽的景象之一。 Many people like watching blue whales __________, and they think it is one of the most __________ things to see. 3. 蓝鲸生活在除北冰洋以外的所有海洋中。 Blue whales live in all oceans __________ the Arctic Ocean. 4. 蓝鲸每天可以吃掉大约四吨的食物。 A blue whale can eat around four __________ of food a day. 5. 当蓝鲸在海上死亡时，它会成为许多海洋及附近动物的食物。 When a blue whale dies at sea, it becomes __________ for many kinds of animals living in and around the sea. 拓展思考 用第一人称“I”改写课文第一段，想象你是一头蓝鲸，介绍自己。写一段话（至少5句），内容包括你的体重、居住地、食物、寿命等。使用 I am, I weigh, I live in, I eat, I can live up to 等表达。 _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 参考答案与解析 小试牛刀 A 1. the largest and heaviest 2. as much as 3. some of the tiniest 4. live up to 5. a lively ecosystem 小试牛刀 B 1. Is the blue whale the largest animal on earth? Yes, it is. / No, it isn’t. 2. Do blue whales eat around four tons of food a day? Yes, they do. / No, they don't. 3. Do they live in all oceans except the Arctic Ocean? Yes, they do. / No, they don’t. 配套练习 A 1. B 2. C 3. C 4. C 5. A 配套练习 B 1. largest; heaviest 2. swim; beautiful 3. except 4. tons 5. food 拓展思考（示例） Hello everyone! My name is Billy the Blue Whale. I am the largest and heaviest animal on earth. I can weigh as much as 200 tons. I live in all oceans except the Arctic Ocean. My favourite food is some of the tiniest animals in the sea. I can eat around four tons of them every day. I can live up to 90 years. Many people think it’s beautiful to watch me swim. I hope you will help protect me and my home. 1 学科网（北京）股份有限公司 $