题目

下列各式中，运算正确的是（ ）A. B. C. 2+＝2 D. 答案：【答案】A【解析】直接利用二次根式的性质分别化简计算得出答案．A. ，正确； B. ，不正确；C. 2+不能计算，不正确； D. ，不正确；故选A.If you want to learn a new language, the very first thing to think about is why. Do you need it for a ___36___reason, such as your job or your studies?___37____ perhaps you’re interested in the ___38____ , films or music of a different country and you know how much it will help to have a ___39____ of the language.Most people learn best using a variety of ___40____, but traditional classes are an ideal（理想的）start for many people. They___41__an environment where you can practice under the __42___ of someone who’s good at the language. We all lead ___43___ lives and learning a language takes __44___. You will have more success if you study regularly, so try to develop a ___45___. It doesn’t matter if you haven’t got long. Becoming fluent in a language will take years, but learning to get by takes __46__.Many people start learning a language and soon give up. “I’m too __47___, ” they say. Yes, children do learn languages more __48___ than adults, but research has shown that you can learn a language at any ___49___. And learning is good for the health of your brain, too. I’ve also heard people ___50___ about the mistakes they make when ___51___. Well, relax and laugh about your mistakes __52____ you’re much less likely to make them again.Learning a new language is never ___53___. But with some work and devotion, you’ll make progress. And you’ll be __54___ by the positive reaction of some people when you say just a few words in ___55___ own language. Good luck!【小题1】A．technicalB．politicalC．practicalD．physical【小题2】A．AfterB．SoC．ThoughD．Or【小题3】A．literatureB．transportC．agricultureD．medicine【小题4】A．viewB．knowledgeC．formD．database【小题5】A．paintingsB．regulationsC．methodsD．computers【小题6】A．protectB．changeC．respectD．provide【小题7】A．controlB．commandC．guidanceD．pressure【小题8】A．busyB．happyC．simpleD．normal【小题9】A．courageB．timeC．energyD．place【小题10】A．theoryB．businessC．routineD．project【小题11】A．some risksB．a lot lessC．some notesD．a lot more【小题12】A．oldB．nervousC．weakD．tired【小题13】A．closelyB．quicklyC．privatelyD．quietly【小题14】A．ageB．speedC．distanceD．school【小题15】A．worryB．hesitateC．thinkD．quarrel【小题16】A．singingB．workingC．bargainingD．learning【小题17】A．ifB．andC．butD．before【小题18】A．tiresomeB．hardC．interestingD．easy【小题19】A．blamedB．amazedC．interruptedD．informed【小题20】A．theirB．hisC．ourD．your