单选题:根据下列文章,请回答题。A Star Is Born1 The VLT(Very Large Telescope)is

  • 题目分类:理工类
  • 题目类型:单选题
  • 查看权限:VIP
题目内容:
根据下列文章,请回答题。A Star Is Born1 The VLT(Very Large Telescope)is the world’s largest telescope(望远镜)and is taking astronomers(天文学家)further back to the Big Bang than they ever thought possible.Located 2,600 metres up in the Chilean Andes,it has four huge mirrors.each" about the size of a London bus.The VLT is SO powerful it can spot a burning match1 0,000 kilometres away.
2 This astonishing power will allow astronomers to see events in space from the birth of stars to the collision(碰撞)of galaxies(星系)on the edge of the cosmos(宇宙).The VLT is giving astronomers their best-ever view of the cosmos.The power of the VLT to see the smallest detail at the furthest distances makes its designers amazed.
3 Take the case of Eta Carinae,one of the most explosive stars in the universe.This star produces ultraviolet laser rays(紫外线)and it will destroy itself in a few million years, time.It is five times brighter than the sun and when it explodes it is going to be a sight worth waiting for!
4 But it is at distances of millions,even billions,of light years that the VLT really shows its power.The VLT can detect light that set out on its journey before the earth even existed.This gives astronomers their first-ever detailed views of events that took place in the earliest days of the cosmos.
5 In other words,the VLT is a kind of a time machine.It takes astronomers back to a lime when complete galaxies crashed into each other.The effects of these past collisions can now be seen by scientists,and astronomers believe the telescope will reveal more about these exciting events in the years to come.One day,we might be able to say we have traveled back to the beginning of time,and we will have a much clearer picture of how our planet was born.Paragraph l__________ A.Events that took place before the earth existed
B.Power of the telescope
C.Details of Eta Carinae
D.Invention of a time machine
E.Biggest telescope
F.Birth of the new worlds
参考答案:
答案解析:

Some industrialized countries are unwilling to spend money i

Some industrialized countries are unwilling to spend money in reducing pollution

查看答案

危险废物填埋场运行的第一年,应(  )至少取样一次。

危险废物填埋场运行的第一年,应(  )至少取样一次。A.每天 B.每季度 C.每周 D.每月

查看答案

The new product has been a commercial success in the USA.

The new product has been a commercial success in the USA.A.Right B.Wrong C.Not m

查看答案

中国人民银行是国务院反洗钱行政主管部门,依法对金融机构的反洗钱工作进行监督管理。 ( )

中国人民银行是国务院反洗钱行政主管部门,依法对金融机构的反洗钱工作进行监督管理。 ( )

查看答案

在填土路堤施工中,当用不同性质的土填筑时,要求正确的是(  )。

在填土路堤施工中,当用不同性质的土填筑时,要求正确的是(  )。 A.应水平分层、分段填筑,不得混填 B.每种填料压实后的连续厚度不宜小于0.5m C.每种填料

查看答案