选修⑦ Unit 2 课下主题训练 科技发展与信息技术创新，科学精神，信息安全（Word练习）-【新高考方案】2024高考英语一轮复习（老教材 新高考 人教版）

第1页共6页 色学科网书城四 品牌书店·知名教辅·正版资源 b.zxxk.com 您身边的互联网+教辅专家 课下主题训练 科技发展与信息技术创新，科学精神，信息安全 解 A car weighing only a few hundred pounds can travel 500 miles per hour, repair itself and cost less than other cars.It might be hard to imagine such a car, let alone a spaceship.But NASA is trying to make a spaceship that is much better than other ships.The spacecraft has to be as light as it can be.Weight costs money!A new discovery might allow a spacecraft to be lighter.A new material called a "carbon nanotube(might be the answer to the weight problem of building a super spaceship.This material is 600 times stronger than steel. One of the big problems with space travel is space radiation.In space, astronauts need protection against harmful rays.You might think that the metal on a spaceship is the answer.But,metals are the worst for protecting against very dangerous space rays.These rays are made of little pieces called ions When the ions hit metals at very high speed,they can break an atom and cause another type of ray to form.These new rays can be worse than the radiation the metal skins were supposed to stop.Thus,it is very important to block these rays. But we could use carbon nanotubes to make the skins of the spacecraft.Things that are light in weight seem to work the best against these ions.The rays are stopped outside the spacecraft and new rays aren't made. In addition,our super spaceship needs to be able to repair itself.Humans can feel the smallest prods because of tiny sensors that send signals to our brains.Tiny sensors like ours could be built in the new ships.Each sensor could send messages to the computer "brain"of the spacecraftIf something needed to be fixed,the computer could tell the ship to do it. Just as amazing as a car would be to someone 200 years ago,our nanotube spaceship might seem to us.We might actually make the spacecraft of tomorrow, using the technology of today. 葡蕨校招球站健黔种帽辅跳孩趣球地璀 1.What are the features of carbon nanotubes? A.Light and strong. B.T