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Mars is not, it seems, the dry old planet we once believed    1    .Astronauts who are     2    to go there in the next decade may find plenty    3   water to slake (消除) their thirst.And with water present the    4    of finding some sort of life of Mars are    5    brighter.

       This is the view of forty geologists who have been analyzing    6    of pictures and other scientific    7    obtained by robot explorers in the sixties and seventies.

       To begin with, scientists thought the Red planet was as    8    as the Moon    9    dust storms swirling over vast sandy    10    .But now the picture is very different    11    mountains and valleys carved by    12    glaciers and rivers rushing and rumbling deep underground.

       In a report on the analysis of the Martian pictures Dr.Michael Car of the U.S.Geological Survey comments: “I am convinced    13    lots of water on Mars.” Any surface water will be in the    14    of ice.But it could save explorers from    15    to take so much    16    with them.

       The report says    17   Mars probably had a warmer climate in ages    18    due to its axis (轴) having been more tilted (倾斜) towards the sun.

       19     signs of plant or animal life have been detected by instruments landed on Mars,    20    the landing vehicles have been sent there for a few years.

1.A.it is    B.it     C.it to be    D.was

2.A.expected  B.hoped      C.required         D.sent

3.A.to      B.of    C.more       D.in

4.A.chances    B.openings         C.occasions       D.possibility

5.A.quite         B.very        C.much      D.more

6.A.a few        B.many      C.thousand        D.thousands

7.A.skills         B.news       C.intelligence     D.information

8.A.peaceful    B.quiet       C.lifeless    D.dead

9.A.of      B.with        C.for  D.through

10.A.deserts    B.mountains       C.rivers      D.seas

11.A.from       B.between         C.for  D.with

12.A.energetic        B.great       C.heavy      D.powerful

13.A.there’s    B.there’re  C.here’s     D.here’re

14.A.appearance     B.way        C.form       D.shape

15.A.have       B.having     C.carry      D.carrying

16.A.water      B.ice  C.equipment      D.oxygen

17.A.what       B.if     C.how        D.that

18.A.pass        B.past        C.ago         D.before

19.A.Not         B.No  C.Nor        D.Never

20.A.probably         B.perhaps  C.supposed        D.although

1.C   2.A  3.B  4.A  5.C  6.D  7.D  8.C  9.B  10.A  11.D  12.D  13.A  14.C  15.B  16.A  17.D  18.B  19.B  20.D

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B
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