英語四級考試完形填空模擬練習(xí)題(44)

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The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age.Rocket engines have 1 powerful enough to shoot astronauts 2 the earth's gravitational pull and 3 them on the moon.We have now become 4 space.
    英語四級考試完形填空模擬練習(xí)題(44)
    2012年02月01日16:17  來源:新東方在線 【發(fā)表評論】
    摘要:
    英語四級考試完形填空模擬練習(xí)題
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     The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age.Rocket engines have 1 powerful enough to shoot astronauts 2 the earth's gravitational pull and 3 them on the moon.We have now become 4 space.
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     Impressive and complex 5 it may appear, the rocket, which was 6 in China over 800 years 7 , is a relatively simple device.Fuel that is 8 in the rocket engine changes 9 gas.The hot and rapidly 10 gas must escape, but it can do so only 11 an opening that 12 backward.As the gas is 13 with great force, it 14 the rocket in the 15 direction.Like the kick of a gun 16 it is fired, it 17 the laws of nature 18 by Sir Isaac Newton when he discovered that“ 19 every action, there is 20 equal and opposite reaction.”
     1.A.shown B.been C.appeared D.proved
     2.A.against B.despite C.beyond D.from
     3.A.send B.land C.take D.carry
     4.A.travelers B.astronauts C.researchers D.explorers
     5.A.that B.so C.as D.sometime
     6.A.made B.discovered C.developed D.invented
     7.A.in advance B.before C.earlier D.ago
     8.A.round B.contained C.stored D.burned
     9.A.as B.into C.for D.the
     10.A.heating B.escaping C.expanding D.conducting
     11.A.in B.at C.by D.through
     12.A.turns B.goes C.faces D.directs
     13.A.transmitted B.dispersed C.erected D.radiated
     14.A.attracts B.leads C.pulls D.pushes
     15.A.same B.other C.opposite D.wrong
     16.A.that B.when C.if D.although
     17.A.states B.proves C.follows D.breaks
     18.A.described B.discussed C.considered D.made
     19.A.like B.as C.with D.for
     20.A.no B.an C.another D.theCloze