题目

You might have heard of collisions between cars,trains and ships,but satellites?It sounds like something from a movie!But sometimes life can be 1 than the movies.On February 11,a Russian military satellite,Kosmos 2251,smashed into a US communications satellite about 780km above Siberia in Russia.The 2 made more than 500 pieces of debris.
The debris could be very 3 for nearby spacecraft,even a tiny piece could do great harm.The accident occurred in an orbit which many satellites and other spacecraft 4.It means that some countries may have to 5 their spacecraft into different orbits.It is the first satellite crash that has been made 6.People are worried,since they understand how 7 Earth’s orbit has become in recent years.Before the accident,there were already over 300,000 objects 8 the Earth.There are satellites (old and new),spacecraft,and 9 objects.The US and Russia have put the 10 number of objects in space.Both countries are calling on cutting space junk.They are asking for inter

提问时间：2021-01-09

答案

1.C 2.A 3.C 4.D 5.A 6.B 7.A 8.B 9.C 10.A