必修3 Unit4 Astronomy the science of the stars-（课件+达标训练）2023老教材老高考英语【导学教程】新编大一轮总复习（人教版）

[对应学生用书P425] Ⅰ.阅读理解 A (2021·东北三校联合二模)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(碳纳米管)”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 (离子).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 (刺) 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 spacecraft.If 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. 1．What are the features of carbon nanotubes? A．Light and strong. B．Thin and radioactive. C．Self­repairing and weightl