问题 选择题

(10镇江14).下列几种气体可用如图所示装置干燥、收集的正确组合是

①H2 ②O2 ③CO2 ④SO2   ⑤CH4 ⑥NH3

A.①②③

B.②③⑤

C.③④⑥

D.①⑤⑥

答案

答案:D

H2属于中性气体,且密度比空气小,符合要求;O2密度比空气大,不符合要求;CO2密度比空气大,且属于酸性气体不符合要求;SO2属于酸性气体,且密度比空气大,不符合要求;CH4密度比空气小,且属于中性气体,符合要求;NH3密度比空气小,属于碱性气体,符合题意.

故选D.

单项选择题 1.0
完形填空
I am a team leader in an insurance company. We are going through a lot of changes right now, which is   36  much stress for all of us.
A few weeks ago I was having a day so   37  that I even doubted if I had the ability to do this challenging work, and was about ready to change to a less stressful job   38  . Something happened that day to change my way of   39  and I am so appreciative of this young lady. I want to let her know that the small act   40  .
On the top of my cubicle (工作隔间) I have a small collection of lighthouses (灯塔) to let people know where I am sitting   41  my team members have to find me for emergencies.
That day I came into the office and was about to get the day   42  when Crystal came over. I asked if she needed anything. And she said, “I   43  you something.” I looked at her with a   44  look and said, “Well, thank you, but why   45  you buy me anything?” I had never spoke to this young lady   46 . She said, “Every day I stand up and look across the     47  and see your lighthouses. Then I feel I am not alone and I encourage myself that there are always   48  things in life. I saw this on the way to work and thought   49  would like it. I wish it would have the same   50  as your lighthouses do.” In her hand she had a small globe with a lighthouse and a ship on it. I gave her a hug and   51  her. I don’t think she knows how much that small act of   52  changed my day: I remained   53  the rest of the day.
For anyone that reads this, I hope you remember, no matter what the   54  is, you could change someone’s day,   55  even his views on life.
小题1:
A.preventingB.reducingC.causingD.suffering
小题2:
A.funnyB.niceC.badD.dull
小题3:
A.everywhereB.elsewhere C.anywhereD.nowhere
小题4:
A.working B.behavingC.speakingD.thinking
小题5:
A.broke my heartB.touched my heart C.lost my heart D.tore my heart
小题6:
A.in case B.so thatC.as if D.even though
小题7:
A.endedB.startedC.changedD.avoided
小题8:
A.borrowedB.lentC.soldD.bought
小题9:
A.delightedB.puzzledC.thankfulD.worried
小题10:
A.mightB.dareC.could D.would
小题11:
A.beforeB.thenC.since D.after
小题12:
A.dormB.officeC.shipD.tower
小题13:
A.brightB.challengingC.bad D.stressful
小题14:
A.colleaguesB.leadersC.youD.I
小题15:
A.opinion B.cause C.expectationD.effect
小题16:
A.praised B.thankedC.scoldedD.refused
小题17:
A.justiceB.courageC.kindnessD.tolerance
小题18:
A.carefulB.encouragedC.tired D.alone
小题19:
A.presentB.workC.actD.intention
小题20:
A.soB.forC.orD.nor