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Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
A.excludeB.eliminateC.extinguishD.impose
A
 exclude 排除。extinguish扑灭;eliminate消除。
  impose 把......强加给:Don't impose your wishes on us.(不要把你的意思强加给我们。)
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