单元限时训练(2) A卷 Unit 2 Out of This World（Word练习）-【优化指导】2023-2024学年新教材高中英语选择性必修第三册（译林版2020）

单元限时训练(二)　A卷 [对应学生用书P143] (限时40分钟) Ⅰ.阅读理解 A What's a spacewalk？Any time an astronaut gets out of a spacecraft while in space，it is called a spacewalk.Astronauts go on spacewalks for many reasons.For example，experiments can be placed on the outside of a spacecraft.This lets scientists learn how being in space affects different things.By going on spacewalks，astronauts can also fix things instead of bringing them back to Earth to fix. When astronauts go on spacewalks，they wear spacesuits to keep themselves safe.Inside spacesuits，astronauts have the oxygen they need to breathe and the water they need to drink.To keep the astronauts and the spacecraft safe，the astronauts must leave and go back to the spacecraft through a special door.When on a spacewalk，astronauts use safety tethers to stay close to their spacecraft.Tethers are like ropes，and connect the spacewalkers with the spacecraft.They keep astronauts from floating away into space.Another way astronauts stay safe during spacewalks is by wearing a SAFER.The SAFER is worn like a backpack.It helps an astronaut move around in space. How do astronauts train for spacewalks？One way is by going for a swim.Floating in space is a lot like floating in water.Astronauts practice spacewalks underwater in a huge special swimming pool.For every one hour they will spend on a spacewalk，astronauts need to train seven hours in the pool.Another way astronauts practice for a spacewalk is by using virtual reality(虚拟现实).It looks and feels just like a spacewalk. Today，only three countries have finished spacewalks independently.They are Russia，the United States and China.The first person to go on a spacewalk in the world was Alexei Leonov from Russia.Zhai Zhigang is the first Chinese astronaut to go on a spacewalk.The world record of spacewalks is held by Russian astronaut Anatoly Solovyev.He has been on 16 spacewalks and spent more than 82 hours outside in space. [语篇解读]　本文是一篇说明文。文章主要介绍了宇航员是如何进行太空漫步的。 1．How many ways are used to keep the