For hundreds of years humans have dreamt of finding life on distant planets.Now the hope of discovering real evidence of life has greatly  1  .

   NASA’s Mars detector (火星探测器),Opportunity,succeeded in finding  2  that water  3   existed on the planet.Opportunity landed on Mars in January.Scientists now believe that the planet could once have supported  4  .

   This discovery was  5  by Science,one of the worlds  6  magazines,as the most important scientific achievement of 504 last Friday.

   “This little,wheeled,one-armed box went around another  7  and has done something  8   human has ever managed,” according to Science.“It has discovered another place in the universe where life  9  once have existed.”

   “  10  we still can’t say that life could have existed in this environment,it is now  11  that there was water on Mars,” said Steve Squyres,one of the scientists  12  the Mars mission (任务).The evidence comes from pictures and chemical readings taken by Opportunity.It  13  marks on rocks like those caused by flowing water on Earth and salty chemicals like those  14  in dried-out sea-beds.Scientists said the new evidence  15  beyond doubt that water has existed on Mars.

   But it is still unknown  16  the water on Mars was like an ocean or just ice.

   While Opportunity has not found any signs of life,the  17  of water means life is possible.”In everything we know about life on Earth,there is no  18  without liquid water,”Squyres said “So water is important for the search for life on Mars.”

   Researchers agree that a future mission should bring back physical samples (样品).But some scientists worry about the risk that this could  19  dangerous foreign creatures to Earth.

   “The  20  here is how to get the samples back,” Squyres replied.“I think it is our responsibility to limit any risk.”

1.A.decreased       B.reproduced      C.disappeared     D.increased

答案:D

提示:从后面的内容可知,人们对发现的生命“印痕”越多,希望就增长。

2.A.signs         B.signals       C.marks        D.symbols

答案:A

提示:火星探测器寻找水存在的痕迹。

3.A.never         B.hardly        C.once        D.now

答案:C

提示:从前一句“succeed”可以推知“曾经”有水存在。

4.A.water         B.air         C.science       D.life

答案:D

提示:根据文章第一段的第一句可知。

5.A.defined        B.absorbed       C.benefited       D.chosen

答案:D

6.A.trusting        B.leading       C.sensitive       D.varied

答案:B

提示:根据常识和前后语境可知这本杂志非常重要。

7.A.ocean        B.solid        C.substance       D.planet

答案:D

8.A.only         B.few         C.no         D.hardly

答案:C

提示:这台机器做了人类从没做成的一些事。

9.A.should        B.must        C.would        D.could

答案:D

提示:could表示可能性的推测。

10.A.Since       B.Thus         C.Although      D.Unless

答案:C

提示:根据前后意思,此处缺少一个引导让步状语从句的连词。

11.A.likely       B.impossible      C.certain       D.positive

答案:C

提示:It’s certain that指……

12.A.working on     B.working out     tributing to    D.devoting to

答案:A

13.A.ranges       B.includes       C.defines      tains

答案:B

提示:include指“包括”,contains指“容器包容”。

14.A.found       B.frozen        C.floated       D.dissolved

答案:A

提示:被发现的那些物体。

15.A.trusted      B.discovered       C.proved       D.reminded

答案:C

提示:新的证据“证明了火星上曾有水存在”。

16.A.that       B.whether        C.why        D.when

答案:B

提示:whether...or...引导出一个主语从句。

17.A.absence      B.presence        C.density       D.salinity

答案:B

提示:presence指“存在”。

18.A.example       B.property       C.motion       D.variety

答案:A

19.A.destroy       B.introduce       C.invite       D.attract

答案:B

提示:有可能会把外星上的危险生物引到地球上来。

20.A.doubt        B.response       C.reply       D.problem

答案:D

提示:从后面“risk”可知前面应为难题。

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