Unit5知识点Understanding ideas练习 2025-2026学年外研版八年级英语下册

八年级英语下册Unit5知识点-Understanding ideas练习 小试牛刀 A. 从故事中找出下列动词的过去式，并写出原形 过去式（从文中找） 动词原形 imagined __________ believed __________ looked __________ found __________ were __________ held __________ grew __________ proved __________ did __________ used to believe __________ changed __________ B. 用 can, may, might 或 could 填空 1. Amber __________ tell us whether dinosaurs had feathers. 2. In the future, amber __________ help us discover other species. 3. Who knows whether this piece of amber __________ tell us more secrets? 4. Scientists used to believe that ants came from the north, but the discovery __________ change old beliefs. 5. As a window on the past, amber has been studied, but it __________ still not be fully understood. 配套练习 A. 单项选择（★） 从A、B、C、D中选择最佳答案。 1. “Scientists found the tail of a dinosaur.” 中的 “found” 是： A. 动词原形 B. 过去式 C. 现在分词 D. 第三人称单数 2. 下列哪个动词的过去式是不规则变化？ A. imagined B. believed C. looked D. held 3. “Amber can tell us whether dinosaurs had feathers.” 中的 “can” 表示： A. 能力 B. 许可 C. 可能 D. 必须 4. “Who knows whether this amber might tell us more secrets?” 中的 “might” 表示： A. 一定 B. 可能 C. 能力 D. 应该 5. 下列句子中，一般过去时使用正确的是： A. People believe dinosaurs looked like lizards. B. People believed dinosaurs looked like lizards. C. People have believed dinosaurs looked like lizards. D. People will believe dinosaurs looked like lizards. B. 完成句子（★★） 根据中文提示和短文内容，用正确的动词过去式或情态动词完成句子。 1. 数百年来，人们认为恐龙看起来像巨大的蜥蜴。 For hundreds of years, people __________ that dinosaurs looked like huge lizards. 2. 在东南亚的一块琥珀中，科学家发现了带有羽毛的恐龙尾巴。 In a piece of amber from Southeast Asia, scientists __________ the tail of a dinosaur – with feathers. 3. 琥珀可以告诉我们恐龙是否有羽毛。 Amber __________ tell us __________ dinosaurs had feathers. 4. 这一发现证明了3500万年前这里确实生长着这种花。 The find __________ that the flower __________ grow here 35 million years ago. 5. 琥珀可能在未来帮助我们揭示更多自然的秘密。 In the future, amber __________ help us discover more secrets of nature. C. 补全对话（★★★） 根据短文内容和语法知识，从方框中选择合适的句子完成对话。 A. They found a dinosaur tail with feathers in amber. B. It can tell us whether dinosaurs had feathers. C. It might help us discover more secrets in the future. D. People used to believe dinosaurs looked like lizards. Tom: What did scientists discover in amber? Lucy: (1) __________ Tom: That’s amazing! What else can amber tell us? Lucy: (2) __________ It can also show how life has changed. Tom: What did people think before this discovery? Lucy: (3) __________ Tom: Will amber help us learn more? Lucy: Yes. (4) __________ D. 拓展思考（★★★） 请根据要求完成以下任务。 Part 1（一般过去时） 用一般过去时写三句话，描述你曾经了解到的一个科学发现或历史事实。 1. ____________________________________________________________ 2. ____________________________________________________________ 3. ____________________________________________________________ Part 2（情态动词can, may, might） 用 can, may, might 各写一个句子，预测未来科学可能带来的变化。 4. (can) ________________________________________________________ 5. (may) ________________________________________________________ 6. (might) ______________________________________________________ Part 3（综合） 写一段话（至少4句）谈谈你对琥珀或其他自然“时间胶囊”（如化石、冰芯等）的看法。使用一般过去时（描述已知事实）和至少两个情态动词（表达可能性或能力）。 ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ 参考答案与解析 小试牛刀 A 过去式 动词原形 imagined imagine believed believe looked look found find were be held hold grew grow proved prove did do used to believe use to believe changed change 小试牛刀 B 1. can 2. may / might 3. might / could 4. could / can 5. may / might 配套练习 A 1. B 2. D 3. A 4. B 5. B 配套练习 B 1. believed 2. found 3. can, whether / if 4. proved, did 5. may / might 配套练习 C 1. A 2. B 3. D 4. C 配套练习 D（参考示例） 1. Last year, I learned that scientists found a new species of dinosaur in Patagonia. 2. They discovered that some dinosaurs had feathers. 3. People once believed that the earth was flat. 4. Science can help us understand the past. 5. New technology may help us find more fossils. 6. Future discoveries might change what we know about history. 7. Amber is like a time capsule. It can keep insects, plants, and even dinosaur tails for millions of years. Scientists have studied amber for a long time, and they found many surprises. For example, they discovered that some dinosaurs had feathers. In the future, amber may help us learn how species changed over time. It might also unlock secrets we never imagined. 1 学科网（北京）股份有限公司 $