(练习)课时分层作业4 Unit 2 Out of This World-【提分教练】2023-2024学年新教材高中英语选择性必修第三册(译林版2020)

课时分层作业(四) Ⅰ.单词拼写 1．The force of gravity(地球引力) makes things fall to earth. 2．The competition has been thrown wide open by the absence(缺乏) of the world champion. 3．I'm not bothered(担心) about the cost—you're the one who's making an issue of it. 4．A copy of the report is available for you to peruse at your leisure(闲暇). 5．The workman was disciplined(惩罚) by his company but not dismissed. 6．He said he had not discussed the matter with her.Furthermore(再者)，he had not even contacted her. 7．She never discovered the true circumstances(情况) of her birth. 8．She did none of the maintenance(保养，维护) of the vehicle. 9．For each side of the subject，think carefully and evaluate(评估) it. 10．He was not clear on the precise nature of his mission(使命). Ⅱ.阅读理解 A Wherever we humans go, we leave behind a mess.That goes for space, too.An estimated 500，000 pieces of debris (碎片) litter the Earth's orbit as a result of man's exploration of space.Some satellites have been hit by fast­moving pieces of junk.The remains of old rockets can be the size of a bus, while other pieces of debris are simply tiny spots of paint. Today, our species is responsible for the junk dashing around Earth at high speed, and if we don't start actively removing the largest pieces, the risk of collisions will only increase.“Imagine how dangerous sailing the high seas would be, if all the ships ever lost in history were still floating on top of the water，” says Jan Wörner, the ESA's director general.“That is the current situation in orbit, and it cannot be allowed to continue.” It's almost as if we need a truck to remove all of the failed satellites from our orbit.By 2025, the agency plans on launching the world's first orbiting junk collector, a four­armed robot that tracks down space waste.The first­of­its­kind task, known as ClearSpace­1, is collecting only a single piece of space junk to prove the concept works.The target in this case is called Vespa, a leftover from the ESA's Vega rocket launched in 2013.This piece of ju