Although certain factors that may lead to cancer have been（  ）the basic causes are still unknown。

试卷相关题目

• 1If the world is to remain peaceful, the utmost effort must be made by nations to limit local（  ）。

  A.conflicts

  B.combats

  C.collisions

  D.contradictions

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• 2Both parties promised to（  ）the contract they had already speed。

  A.keep with

  B.tangle with

  C.devote to

  D.adhere to

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• 3It’s a pleasure for him to（  ）his energy and even his life to scientific research。

  A.dedicate

  B.dictate

  C.decorate

  D.direct

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• 4They got（  ）with each other when they met at the party last month。

  A.identified

  B.recognized

  C.acquainted

  D.acknowledged

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• 5Generally, only when animals are trapped do they（  ）to violence in order to escape。

  A.proceed

  B.appeal

  C.resort

  D.incline

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• 6There were occasional outbreaks of gunfire in that are（  ）but the rebellion had been（  ）。

  A.canceled

  B.destroyed

  C.restrained

  D.suppressed

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• 7 Mike didn’t realize that his passport had already（  ）。

  A.abolished

  B.expired

  C.limited

  D.dismissed

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• 8We should take measures to protect the species that would soon disappear or become（  ）。

  A.extinct

  B.extinguished

  C.feeble

  D.dead

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• 9The doctor（  ）that his patient will recover in three months。

  A.articulates

  B.anticipates

  C.wishes

  D.looksforward to

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• 10She cut her hair short and put on an overcoat,trying to（  ）herself as a man。

  A.disguise

  B.decorate

  C.pretend

  D.make

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