Unit 5 Power of Ideas 单元练习 【教材语篇改编回顾】 A语法填空（改编自Section A 3a对话） Back in the 1890s， people used handwritten 1. （letter） or wired telephones to pass information， but Guglielmo Marconi tried 2. （he） best to find a new way to communicate. He spent all his free time doing experiments and made small 3. important changes after each failure. His work finally paid off. In 1901， for the 4. （one） time， he made history with a brave try. He tried to send a simple radio message 5. （rapid） to his team. 6. everyone’s surprise， the message travelled across the Atlantic Ocean. The news of this amazing achievement shocked 7. whole world. Marconi’s invention made the huge world feel much 8. （small）—news could travel across the world in just seconds instead of spreading 9. （slow） for days or even weeks. Later， the radio also led to other great inventions that 10. （invent） with its help. B选词填空（改编自Section B 1b短文） make in although suit ideal boil up pour need final with culture In ancient China， people used bamboo， wood and silk to write on， but none of these were 1. . So， a cheap and practical writing material 2. . During the Eastern Han Dynasty， Cai Lun noticed that tree bark was used 3. clothes， which gave him an idea—certain plants could be turned into a material 4. for writing. Cai Lun did many experiments. First， all the collected materials were mixed and 5. for a long time. Then the softened mixture was beaten， cut up， and mixed with clean water again. After 6. the liquid over a bamboo screen to get fibres， he dried and pressed the wet fibres. 7. ， thin and light paper was created. This papermaking technique not only speeded 8. the development of Chinese culture， but also improved 9. exchanges in the bined with printing， it led to a rapid increase in the number of books， which resulted 10. the birth of more new knowledge. C语法填空（改编自Section B 3a短文） The Wright brothers had a strong dream to make humans fly like birds. They spent years watching how 1. （bird） spread their wings and keep their balance in the air， 2. （take） detailed notes and doing countless experiments. At first， they built simple gliders and tested 3. （they） again and again， making small changes each time to improve speed 4. balance. In 1903， they finally created a powered plane 5. a small engine. On a windy morning， their plane took off 6. （successful）. Later， they kept 7. （improve） their design to make planes fly 8. （fast） and more smoothly. Today， their great invention 9. （change） the world completely， turning long-distance travel into 10. easy and quick thing for people all over the world. 【主题情境深度阅读】 发明是推动社会进步的核心动力，它能打破时空的限制，将遥不可及的理想转化为触手可及的现实，深刻改变着人类的生活方 ... ...
