5.3.6g碳在一定量的氧氣中燃燒,反應(yīng)后生成的氣體質(zhì)量為9.2g。則在標(biāo)準(zhǔn)狀況下,生成物CO和CO2的體積比為( C )
A.3:2 B.4:1 C.5:1 D.7:4
4.在等體積的NaCl、MgCl2、AlCl3三種溶液中,分別加入等量的AgNO3溶液,恰好都完全反應(yīng),則以上三種溶液的物質(zhì)的量濃度之比為( D )
A.1:2:3 B.3:2:1 C.1:1:1 D.6:3:2
3.將5mol/L的Mg(NO3)2溶液a mL稀釋至b mL,稀釋后溶液中NO3-的物質(zhì)的量濃度為( D )
A.mol/L B.mol/L C.mol/L D.mol/L
2.在反應(yīng)3Cu2S+22HNO36Cu(NO3)2+3H2SO4+10NO+8H2O中,1mol還原劑失去原子的物質(zhì)的量為( C )
A.6mol B.8mol C.10mol D.12mol
1.與8g SO3中氧原子數(shù)相同的是(B )
A.9.6g H2SO4 B.6.6g CO2
C.6.4g SO4 D.6.72L CO(常溫、常壓)
第二節(jié) 書面表達(dá)(滿分30分)
假設(shè)你是李華,你的外國網(wǎng)友Tom最近從網(wǎng)上了解到有關(guān)中國的“留守學(xué)生(leftbehind students)”的問題,但不是很明白,為此,他通過電子郵件向你詢問。請根據(jù)下列要點用英語給Tom回一封120詞左右的電子郵件:
“留守學(xué)生”產(chǎn)生的原因:父母外出打工,無法照顧子女;
“留守學(xué)生”遇到的現(xiàn)實問題;
你對解決“留守學(xué)生”問題的看法。
Dear Tom,
I am very glad that you asked me the question about the problem with the “l(fā)eftbehind students” in China.
________________________________________________________________________
________________________________________________________________________
Best regards.
Li Hua
第一節(jié) 短文改錯(共10小題;每小題1分,滿分10分)
(寧波四中2009-2010學(xué)年度期中考試卷)
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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