问题
选择题
氢气在氯气中燃烧时产生苍白色火焰。在反应过程中，破坏1 mol氢气中的化学键消耗的能量为Q1 kJ，破坏1 mol氯气中的化学键消耗的能量为Q2 kJ，形成1 mol氯化氢中的化学键释放的能量为Q3 kJ。下列关系式中，正确的是[ ]
A．Q1＋Q2＞Q3
B．Q1＋Q2＞2Q3
C．Q1＋Q2＜Q3
D．Q1＋Q2＜2Q3
答案
答案：D
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氢气在氯气中燃烧时产生苍白色火焰。在反应过程中，破坏1 mol氢气中的化学键消耗的能量为Q1 kJ，破坏1 mol氯气中的化学键消耗的能量为Q2 kJ，形成1 mol氯化氢中的化学键释放的能量为Q3 kJ。下列关系式中，正确的是[ ]
A．Q1＋Q2＞Q3
B．Q1＋Q2＞2Q3
C．Q1＋Q2＜Q3
D．Q1＋Q2＜2Q3
答案：D
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| The night started our ordinarily enough.Jack and Tara,our__1__,were in their small beds surrounded by toy animals.My husband,Pat,and I went to sleep__2__. __3__after midnight,Jack quietly touched me."Mommy,I want to stay with you.I promise I won't take much room." I shifted__4__to make room.My son soon fell asleep. An hour later,Tara cried and I carefully went downstairs."Mommy,my__5__is all stuffed up (堵住)．I can't really breathe very well.Will you please__6__with me a little while?" Tara doesn't often get up at night,__7__I decided to be there for her.She soon fell asleep.I returned to my own bed.I was determined to sleep.But to my__8__,I found Jack sleeping on my side of the bed.He looked so__9__that I couldn't remove him.Quietly and carefully,I lay down between__10__and Jack. I did manage to get some sleep__11__I heard Tara's voice again.I returned to__12__Tara."Mom, please lie down with me a little bit.I had a bad dream,and I'm so__13__.""Of course,honey.It was only a dream.Mommy's here and__14__is okay." We fell asleep__15__each other's arms. Even in my sleepy state,I thought of__16__these nights of merrygoround (一连串的繁忙活动) will be over.In their place,my twins will be grown.__17__before I'm ready,our children's rooms will be much too __18__and empty.So it is especially on days when I'm worn out after a  night on this mom's merrygoround that I remind__19__that these very days and nights are,in fact,"the good old days",ever so__20__. | |||
| ( )1. A. sons ( )2. A. downstairs ( )3. A. Sometimes ( )4. A. gently ( )5. A. nose ( )6. A. come ( )7. A. even though ( )8. A. joy ( )9. A. friendly ( )10. A. my father ( )11. A. before ( )12. A. show off ( )13. A. scared ( )14. A. something ( )15. A. over ( )16. A. how often ( )17. A. No doubt ( )18. A. noisy ( )19. A. my children ( )20. A. potential | B. twins B. in B. Every time B. kindly B. mouth B. stay B. so B. anger B. heavy B. Tara B. when B. look after B. exciting B. anything B. on B. how soon B. No wonder B. quiet B. my husband B. precise | C. daughters C. out C. Sometime C. rudely C. heart C. talk C. no matter when C. disappointment C. content C. Pat C. after C. watch out C. excited C. everything C. by C. how long C. No problem C. still C. my friend C. precious | D. students D. upstairs D. Anytime D. impatiently D. eye D. play D. however D. surprise D. sad D. my mother D. while D. take care D. scaring D. nothing D. in D. how much D. No worry D. calm D. myself D. previous |