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5.3.6g碳在一定量的氧气中燃烧,反应后生成的气体质量为9.2g。则在标准状况下,生成物CO和CO2的体积比为(  C )

A.3:2      B.4:1      C.5:1      D.7:4

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4.在等体积的NaCl、MgCl2、AlCl3三种溶液中,分别加入等量的AgNO3溶液,恰好都完全反应,则以上三种溶液的物质的量浓度之比为( D  )

A.1:2:3     B.3:2:1     C.1:1:1     D.6:3:2

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3.将5mol/L的Mg(NO3)2溶液a mL稀释至b mL,稀释后溶液中NO3的物质的量浓度为(  D  )

A.mol/L   B.mol/L   C.mol/L    D.mol/L

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2.在反应3Cu2S+22HNO36Cu(NO3)2+3H2SO4+10NO+8H2O中,1mol还原剂失去原子的物质的量为(  C )

A.6mol     B.8mol      C.10mol     D.12mol

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1.与8g SO3中氧原子数相同的是(B   )

A.9.6g  H2SO4        B.6.6g CO2

C.6.4g  SO4        D.6.72L CO(常温、常压)

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第二节 书面表达(满分30分)

假设你是李华,你的外国网友Tom最近从网上了解到有关中国的“留守学生(left­behind students)”的问题,但不是很明白,为此,他通过电子邮件向你询问。请根据下列要点用英语给Tom回一封120词左右的电子邮件:

“留守学生”产生的原因:父母外出打工,无法照顾子女;

“留守学生”遇到的现实问题;

你对解决“留守学生”问题的看法。

Dear Tom,

I am very glad that you asked me the question about the problem with the “left­behind students” in China.

________________________________________________________________________

________________________________________________________________________

Best regards.

Li Hua

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第一节 短文改错(共10小题;每小题1分,满分10分)

(宁波四中2009-2010学年度期中考试卷)

It is five years now since I graduate from No.3 High School.Last Saturday,the class that I was in held a get­together,which took us a long time prepare.It was indeed not easy to get in the touch with everybody and set a well time for all of us.We all enjoyed this precious day greatly,remember the time we spent together and the people they were familiar with.It was a pity which some of us were not present as they had gone to abroad for further studies,and they called back or sent greeting card from different places.   

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