Unit 6 Section B 3a～Self Check同步练习 2025-2026学年人教版（2012）英语九年级全册

Unit 6 When was it invented? Section B (3a~Self Check)   一、根据首字母或句意提示写出单词 1. It is often difficult to decide on the i__________ of certain inventions. 2. Sometimes a few people may invent things which are nearly the s__________. 3. Some inventions can also lead to other inventions a__________ of a sudden. 4. Some people d__________ whether the inventor came up with the idea himself or herself. 5. Books or websites usually mention more than one i__________ when giving information about inventions. 二、用单词的正确形式填空 1. It is often difficult to decide on the inventor of __________ (certain) inventions. 2. Sometimes a few people may invent things which are nearly the __________ (same). 3. Some inventions can also lead to other inventions __________ (sudden). 4. Some people doubt whether the inventor came up with the idea __________ (he) or herself. 5. Books or websites usually mention more than one __________ (invent) when giving information about inventions. 三、单项选择题 ( ) 1. It is often difficult to decide ______ the inventor of certain inventions. A. on  B. in  C. at ( ) 2. Sometimes a few people may invent things ______ are nearly the same. A. who  B. which  C. what ( ) 3. It's hard to tell who came ______ with the idea first. A. up  B. on  C. in ( ) 4. Some inventions can also lead ______ other inventions all of a sudden. A. in  B. to  C. for ( ) 5. Some people doubt ______ the inventor came up with the idea himself or herself. A. that  B. whether  C. what ( ) 6. They think that the inventor used someone ______ idea to create his or her invention. A. else  B. else's  C. else' ( ) 7. Books or websites usually mention more than one inventor when ______ information about inventions. A. give  B. giving  C. to give ( ) 8. Someone ______ my watch yesterday. A. steal  B. stole  C. stolen ( ) 9. Five eggs ______ to make this big cake. A. used  B. were used  C. are used ( ) 10. When ______ the personal computer invented? A. was  B. were  C. did 四、选词填空（二选一） 1. It is often difficult to decide on the __________ (inventor / invention) of certain inventions. 2. Sometimes a few people may invent things which are nearly the __________ (same / different). 3. Some inventions can also lead to other inventions __________ (all of a sudden / suddenly). 4. Some people __________ (doubt / believe) whether the inventor came up with the idea himself or herself. 5. Books or websites usually __________ (mention / invention) more than one inventor. 五、根据汉语意思完成句子 1. 有时很难确定某些发明的发明者。 It is often difficult to decide __________ the inventor of __________ inventions. 2. 有时几个人可能发明几乎相同的东西。 Sometimes a few people may invent things __________ are nearly the __________. 3. 很难说谁先想出了这个主意。 It's hard to tell who __________ __________ with the idea first. 4. 一些发明也可能突然导致其他发明。 Some inventions can also __________ __________ other inventions all of a sudden. 5. 这就是为什么书籍或网站在提供发明信息时通常会提到不止一个发明者。 That is why books or websites usually __________ more than one inventor when __________ information about inventions. 六、补全对话 根据对话内容，从方框中选择恰当的句子补全对话，其中有一项多余。 A: I'm working on a project about inventions. Can you help me? B: 1.__________ What do you need to know? A: I want to know about the invention of the telephone. B: 2.__________ A: Alexander Graham Bell. And it was invented in 1876. B: 3.__________ A: It was used for communicating over long distances. B: 4.__________ A: Yes, it has changed a lot. Now we have smartphones. B: 5.__________ A: I think it's one of the most important inventions in history. A. Who invented it? B. Of course! C. Has it changed over time? D. What was it used for? E. When was it invented? F. That's interesting! 七、阅读理解 阅读下面短文，从每题所给的A、B、C三个选项中选出最佳选项。 Deciding who invented something can be very difficult. Sometimes, more than one person invents the same thing at almost the same time. For example, both Alexander Graham Bell and Elisha Gray invented the telephone around the same time in the 1870s. Bell got the patent first, so he is usually credited as the inventor. Some inventions happen by accident. Potato chips were invented when a cook tried to teach a customer a lesson. He cut potatoes very thin and fried them until crispy. The customer loved them, and a new snack was born. Sometimes, inventions lead to other inventions. The invention of the telephone led to the development of the mobile phone and smartphones. Each new invention builds on the ideas of earlier inventions. When we read about inventions in books or on websites, we often see more than one name mentioned. This is because it's hard to know who really came up with the idea first. Sometimes, many people contribute to an invention over time. ( ) 1. Why is it difficult to decide who invented something? A. Because inventors always work alone. B. Because more than one person might invent the same thing. C. Because inventions are not important. ( ) 2. Who is usually credited as the inventor of the telephone? A. Elisha Gray.  B. Alexander Graham Bell.  C. Both A and B. ( ) 3. How were potato chips invented? A. By accident.  B. By design.  C. By a scientist. ( ) 4. What did the invention of the telephone lead to? A. Potato chips.  B. Mobile phones and smartphones.  C. The internet. ( ) 5. Why do books and websites often mention more than one inventor? A. Because they want to confuse readers. B. Because many people may contribute to an invention. C. Because there is only one inventor for each invention. 八、作文 请根据以下提示，写一篇短文介绍你的一项新发明。内容包括： 1. 这项发明是什么？ 2. 它是谁发明的？ 3. 它是什么时候发明的？ 4. 它有什么用途？ 5. 为什么人们应该购买它？ 要求：语句通顺，语法正确，词数80词左右。 My New Invention ____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ 参考答案 一、首字母或句意提示 1. inventor 2. same 3. all 4. doubt 5. inventor 二、单词正确形式填空 1. certain 2. same 3. suddenly/all of a sudden 4. himself 5. inventor 三、单项选择 1. A 2. B 3. A 4. B 5. B 6. B 7. B 8. B 9. B 10. A 四、选词填空 1. inventor 2. same 3. all of a sudden 4. doubt 5. mention 五、完成句子 1. on, certain 2. that, same 3. came up 4. lead to 5. mention, giving 六、补全对话 1. B 2. A 3. D 4. C 5. F 七、阅读理解 1. B 2. B 3. A 4. B 5. B 八、作文（参考范文） My New Invention My new invention is a special pen called the "Smart Pen". It was invented by me, Liu Jie, in 2025. This pen has three colors and is used for taking notes quickly in class. It has a small computer inside that can record what the teacher says. When you write, it saves your notes to your phone. It is very useful for students who write slowly. It helps them focus on listening instead of worrying about missing important information. I think everyone should buy this pen because it makes studying easier and more fun! 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $