题目

除去下列物质中少量杂质（括号内的物质）的方法，合理的是（    ） A.CaO(CaCO3)：加入足量的稀盐酸 B.CO2(CO)：在氧气中点燃 C.H2(HCl、H2O)：通过盛有足量生石灰和烧碱混合固体的干燥管 D.N2(O2、H2O)：先通过加热的铜网，再通过盛有浓盐酸的洗气瓶 答案：CI returned to Abujs,the capital of Nigerin,after college gradvation.I had been there before my mother became a minister. Two weeks Inter.I told  my mother I was bored.She said.“Here’re the car keys.Go and buy some fruit.”  1   ,I jurnped into the car and speeded off. Seeing me or rather my  2   ,a boy sprang up(跳起来).  3    to sell his banan is and peanuts.“Banana 300 naira.Peanut 200 naira!” Looking at his bbinck-striped bananas,I  4    to 200 total for the fruit and nuts. He  5   .I handed him a 500 naira note.He didn’t have  6  .So I told him not to worry.He was  7   and smiled a row of petfect teeth. When.two weeks later.I  8   this same boy.I was more aware of my position in Nigerian soeicty.I should  9   this country as the son of a  10   .But it was hard to find pleasure in a place where it was so  11   to see a little boy who should have been in school selling frust.   “What’s up?”I asked.He answered in  12   English,“I…I no get money to buy book.”I took out two 500 naira notes.He looked around  13   before sticking his hand into the car   14  the bills.One thousand naira means a lot to a farnily that  15   only 50,000 cach year.    The next morning,security officers told me,“In this place,when you give a little,people think you’re a fountain of opportunity(机会).”   16    it’s right,but this happens everywhere in the world.I wondered if my little friend had actually used the money for  17   .     After six months’work in northern Nigeria,I returned and saw him again standing on the road.“Are you in school now?”He nodded.A silence fell as we looked at each other,then I  18    what  he wanted.I held out a 500 naira note.“Take this.”He shook his head fiercely and stepped back  19    hurt.“It’s a gift.”I said.     Shaking his head again,he handed me a basket of bananas and peanuts,“I’ve been waiting to  20   these to you.” 1.A.Encouraged          B.Disappointed        C.Delighted       D.Confused 2.A.car                 B.mother             C.drivet          D.keys 3.A.willing              B.afraid              C.cager          D.ashamed 4.A.got down            B.bargained down      C.put down       D.look down 5.A.explained            B.promised           C.agreed         D.admitted 6.A.change              B.notes              C.checks         D.bills 7.A.troubled             B.regretful           C.comfortable     D.graleful 8.A.ran after             B.ran into            C.ran over        D.ran  to 9.A.proteet              B.enjoy               C.help           D.support 10.A.minister            B.headmaster          C.manager        D.president 11.A.lucky             B.amazing            C.funny           D.common 12.A.old               B.broken              C.traditional      D.modern 13.A.proudly           B.madly               C.cunously       D.nervously 14.A.for               B.with                C.at              D.upon 15.A.spends            B.pays                C.makes          D.affords 16.A.Possibly          B.Actually             C.Certainly        D.Fortunately 17.A.joys              B.nuts                C.books           D.bananas                        18.A.asked             B.unagined            C.reminded        D.realized 19.A.when             B.as if                C.even if          D.after 20.A.send              B.provide             C.sell             D.give