淡水资源占地球水资源的百分比是（ ）。

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• 1 声音可以在固态、液态和气态的介质中传播，传播的速度与介质分子间距有关，分子间距越小，声音的传播速度越快。

  A.铁棒

  B.竹

  C.盐水

  D.液态汞

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• 2自来水表上的一度水表示耗水量为（ ）。

  A.100公斤水

  B.1000公斤水

  C.一吨水

  D.一立方米水

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• 3下列退出PowerPoint2010的方法中，错误的是（ ）。

  A.单击PowerPoint标题栏右上角的关闭按钮

  B.按Alt+F4快捷键

  C.选择文件菜单中的"退出"命令

  D.单击PowerPoint标题栏左上角的控制菜单按钮

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• 4Since its repair, the central heating system in the Rayburn Building is now in ( ) order.

  A. working

  B. practical

  C. realistic

  D. useful

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• 5Mr. Uemura declined to ( ) on rumors about how many medicines the drug manufacturer had in develo

  A. comment

  B. commentary

  C. comments

  D. commenting

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• 6The staff of the document storage facility followed the auditor’s suggestions for corrective action

  A. other

  B. every

  C. either

  D. any

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• 7Job seekers are advised to avoid discussing confidential business knowledge acquired ( ) working

  A. even

  B. beside

  C. while

  D. throughout

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• 8His doctor suggested to him that he ( ) medication everyday.

  A. be taken

  B. takes

  C. take

  D. took

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• 9Contrary ( ) the popular opinion, higher taxes end up benefiting the citizens more than lower one

  A. for

  B. in

  C. to

  D. with

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• 10The company is involved in leasing 216000 trucks and providing ( ) services for customers.

  A. able

  B. logistic

  C. eligible

  D. informative

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