题目

已知侯氏制碱的主要反应原理：NH3+CO2+H2O+NaCl=NaHCO3↓+NH4Cl，利用下列装置制取碳酸氢钠粗品，实验装置正确且能达到实验目的的是（） A . 用装置甲制取氨气 B . 用装置乙制取二氧化碳 C . 用装置丙制取碳酸氢钠 D . 用装置丁分离碳酸氢钠与母液 答案：CThe concept of solitude (独处) in the digital world is almost non-existent. In the world of digital technology, e-mail, social networking and online video games, information is meant to be1. Solitude can be hard to discover 2it has been given up. In this respect, new technologies have 3our culture.The desire to be connected has brought solitude to a(n) 4as we’ve known it. People have become so 5in the world of networks and connections that one can often be contacted 6they’d rather not be. Today we can talk, text, e-mail, chat and blog (写博客), not only from our 7, but from our mobile phones as well.Most developed nations have become 8on digital technology simply because they’ve grown accustomed to it, and at this point not 9it would make them an outsider. 10, many jobs and careers require people to be 11. From this point of view, technology has changed the culture of work. Being reachable might feel like a 12to those who may not want to be able to be contacted at all times.I suppose the positive side is that solitude is still possible for anyone who 13wants it. Computers can be shut 14and mobile phones can be turned off. The ability to be “connected”and “ on”has many 15, as well as disadvantages. Travelers have ended up 16on mountains, and mobile phones have saved countless lives. They can also make people feel 17and forced to answer unwanted calls or18to unwanted texts.Attitudes towards our connectedness as a society 19 across generations. Some find today’s technology a gift. Others consider it a curse. Regardless of anyone’s view on the subject, it’s hard to imagine what life would be like 20daily advancements in technology.1.A.updatedB.receivedC.sharedD.collected2.A.thoughB.untilC.onceD.before3.A.respectedB.shapedC.ignoredD.preserved4.A.edgeB.stageC.endD.balance5.A.sensitiveB.intelligentC.considerateD.reachable6.A.even ifB.only ifC.as ifD.if only7.A.mediaB.computersC.databasesD.monitors8.A.bentB.hardC.keenD.dependent9.A.findingB.usingC.protectingD.changing10.A.AlsoB.InsteadC.OtherwiseD.Somehow11.A.connectedB.trainedC.recommendedD.interested12.A.pleasureB.benefitC.burdenD.disappointment13.A.slightlyB.hardlyC.merelyD.really14.A.outB.downC.upD.in15.A.aspectsB.weaknessesC.advantagesD.exceptions16.A.hiddenB.lostC.relaxedD.deserted17.A.trappedB.excitedC.confusedD.amused18.A.turnB.submitC.objectD.reply19.A.varyB.ariseC.spreadD.exist20.A.beyondB.withinC.despiteD.without