题目

在标准状况下①6.72L CH4②3.01×1023个HCl分子 ③13.6g H2S ④0.2mol NH3, 下列对这四种气体的关系从大到小表达正确的是a．体积②＞③＞①＞④ b．密度②＞③＞④＞①c．质量②＞③＞①＞④ d．氢原子个数①＞③＞④＞②A.abcd B.bcd C.abc D.acd 答案：【答案】A【解析】在标准状况下①6.72L CH4物质的量为0.3mol、 ②3.01×1023个HCl分子物质的量为0.5mol、 ③13.6g H2S 物质的量为0.4mol、④0.2mol NH3,故由阿伏伽德罗定律可知：同温同压下，气体体积之比等于物质的量之比，故各气体体积关系为：②＞③＞①＞④，故a正确；同温同压下各气体密度之比等于摩尔质A friend of mine met with an accident driving in darkness. His legs were so hurt that he couldn’t move. What was the   1  was he found himself unable to ask for help-his mobile phone went out of   2  as a result of exhausted battery. Nothing could be done but to  3  in cold wilderness. It was 8 hours later that day broke, and then the   4  of the rescue. It is almost   5  that he could stand the horror in the darkness for so long. Even more surprising was his  6 : “First of all I checked up my   7  conditions and found myself not in fatal danger. As there was no    8  to call for help, I leaned back in my seat trying my best to keep the wound from  9 .  In this way I dozed (打盹) off.”His story put an end to my regret for the   10  of an exploration adventure that happened last year. A group of young men   11  to explore a mountain cave and got lost.   12  to find a way out in the dark cave they were frightened and ran anxiously without a sense of   13 . Finally they fell dead in fear and exhaustion. According to the   14  people that found them, the place where they got lost was only about 10 meters away from the  15  of the cave. If they stayed on the spot when they lost their way and tried to   16 themselves, they would probably sense a faint light glimmering (闪烁) not far away. Don’t you think that you can compare it with   17  itself? When you meet with obstacles in life and work, you are lost in darkness.   18  you it’s unclear yet and you needn’t put up struggle   19 . It seems to be a negative attitude,  20  a person who can afford to do so must have foresight as well as a great courage in the first place.【小题1】A．hopelessB．worstC．moreD．best【小题2】A．serviceB．wayC．orderD．work【小题3】A．cryB．lieC．waitD．sleep【小题4】A．delayB．successC．teamD．arrival【小题5】A．untrueB．unimaginableC．trueD．useless【小题6】A．planB．decisionC．explanationD．excuse【小题7】A．physicalB．mentalC．workingD．medical【小题8】A．methodB．wayC．alternativeD．strength【小题9】A．rottingB．spreadingC．hurtingD．bleeding【小题10】A．lossB．failureC．disappointmentD．sadness【小题11】A．hadB．managedC．triedD．planned【小题12】A．WillingB．UnableC．DeterminedD．Deciding【小题13】A．hearingB．sightC．feelingD．direction【小题14】A．rescueB．villageC．localD．brave【小题15】A．endB．topC．openingD．side【小题16】A．saveB．helpC．stopD．calm【小题17】A．adventureB．workC．lifeD．mankind【小题18】A．MindB．WatchC．ImagineD．Warn【小题19】A．reallyB．immediatelyC．carefullyD．hopefully【小题20】A．andB．soC．butD．while