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After a few years, Faraday      a job as personal assistant to Sir Humphry Davy
    A. offered      B. will offer     C. had offered     D. was offered

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金屬鉀在氧氣中燃燒能生成超氧化鉀(KO2),KO2與CO2或水作用均生成O2。現(xiàn)將一定量鈉鉀合金在足量氧氣中燃燒,將反應(yīng)產(chǎn)物置于水中并通入足量的CO2,充分反應(yīng)后,最多放出O2的體積是最多吸收CO2的體積的,則原鈉鉀合金中鈉與鉀的質(zhì)量之比為(  )

A.23?36    B.46?39     C.115?39 D.23?78

 

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Not until the train pulled into the station    that his suitcase was gone.

  A.did he find         B.had he found

  C.he had found         D.he found

 

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— Will you go to the party?

— Of course I will _____.

A. if invited                 B. if having invited

C. if I was invited          D. if I will be invited

 

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The president stated that his country would not ________ anybody who raised a hand against their Allies.

A.tolerate B.oppose

C.go against D.distinguish

 

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-- May I look at the menu a little while?

-- Of course. _______ , Sir. I'll be back in a few minutes.

A. Don't worry    B. Enjoy yourself   C. No matter    D. Take your time

 

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      about wild plants that they decided to make a trip to Madagascar for further research.

A.So curious the couple was?        B.So curious were the couple?

C.How curious the couple were?        D.The couple was such curious

 

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After the war, a new school building was put up     there had once been a theatre.

  A.that     B.where    C.which    D.when

 

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Never laugh at failure of _____, because ______ enjoys being laughed at.

A.others; nobodyB.the others; everyoneC.the others; anyoneD.others; someone

 

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—Nancy is not coming tonight.?
—But she_______.?
A.promises  B.promised
C.will promise D.had promised

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