Unit 6 When was it inventedSection B B卷阅读理解：In your schoolbags, you may have a pencil, some kinds of pens, a ruler, and some books. None of these things grow in the fields. They were all made in factories. And, of course, they were invented by some people. There have not always been pencils or pens, a ruler and books. Thousands of years ago no one knew about these things.Who invented them first? How did they have such clever ideas? We always dont know. There have been thousands of inventions, large and small, in the human history. Some of these inventions have changed the world. Such as paper, printing, radios, telephones and computers, and we know the inventors. But we have forgotten most of the other inventors.Who invented the clock, for example, or the lock to the door? We dont know. There have been thousands of inventors and we should be grateful(感激的) to them for their clever ideas. Will you be one of them when you grow up?1. Most things in your schoolbag are made of _. A. paper B. wood C. metal2. The inventors invented these things because _. A. their children were at school B. they hoped to save some money C. they had a lot of clever ideas3. The history books tell us _. A. who invented paper and printing B. who invented clocks and doors C. when the first key was invented4. We dont know _. A. the names of the inventors of paper B. the names of the inventors of telephone C. the names of most inventors5. The writer wonders _. A. if you are an inventor B. if you want to be an inventor C. whats invented by you