C.The discovery can' t fully prove that the Mars once hosted life.
D.The lake traces prove that there exists life on Mars now.
答案:D
推理判断题。由第一段内容可知火星上湖岸线的发现只是增加了人们发现亿万年前火星上曾经存在生命证据的可能性,但并不能推出火星上现在有生命。
阅读理解Blue planets Space is not black,but light green,a team of astronomers announced on January 10.They studied the light sent out by 200 000 galaxies.What they found was that the average colour of the universe is a bit greener than turquoise(绿宝石).
The discovery was part of an attempt to test theories about how stars and galaxies form.Most astronomers believe that the universe probably started with a“blue period”when young blue stars filled space.Now the universe is in a“green period”.They believe it will finally enter a“red period”when the older,redder stars appear.
“The reason for the colour changing is that the rate of stars forming is changing,”said Ivan Baldry,an astronomer who worked to find the average colour of light in the universe.
Research presented by NASA scientists shows that the highest point of starforming may have occurred earlier than previously(以前)believed.It was probably very soon after the“Big Bang(宇宙大爆炸)”that many scientists believe gave birth to the universe.
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