课时达标14 必修三 Unit 4 Astronomy the science of the stars（Word教用版）-【状元桥】2022高考英语一轮总复习（人教新高考版）

课时达标(十四) Ⅰ.阅读理解 主题语境：宇宙探索　难度：☆☆☆☆　 限时：8_min Chinese scientists applied a specially developed new technology to laser­ranging(激光测距) telescopes, which enabled them to identify space waste more effectively than previous techniques, according to a study published in the Journal of Laser Applications.“After improving the pointing accuracy of the telescope through a neural(神经的) network, space debris(碎片) with a cross sectional area of one square meter (10 square feet) and a distance of 1,500 kilometers (932 miles) can be identified，” Tianming Ma, an author of the study from the Chinese Academy of Surveying and Mapping, Beijing and Liaoning Technical University, Fuxin, said in a statement. Debris can include non­functional spacecraft, abandoned launch vehicle stages, and other mission­related space waste.It is very dangerous for astronauts and spacecraft in orbit above the Earth as they travel very fast—up to 18,000 miles per hour.Worryingly, there are probably many millions of tiny debris pieces in low­Earth orbit, and tens of thousands larger than a softball, NASA said.Fortunately, there have been surprisingly few collisions. Laser­ranging technology has previously been used to find space waste.However, these systems have their limitations when it comes to accurately identifying small, fast­moving pieces.In fact, previous laser­ranging methods have only been accurate to within about 0.6 miles. In an attempt to overcome the inaccuracies in laser­ranging techniques, the Chinese team used so­called neural networks to improve the effectiveness of their telescope system.Neural networks are computing systems which are inspired by biological networks in the brain.They can learn to become better at tasks without being given a specific set of rules to follow.Ma and his team tested this method against more traditional techniques at the Beijing Fangshen laser range telescope station.According to the team, this is the first time that neural network has been used to significan