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2.How long can human beings live?Most scientists who study old age think that the human body is (1)discovered to live no longer than 120years.However,110years is probably the longest that anyone could hope to live--if he or she is (2)completely healthy and lucky.Some scientists even say we can live as long as 130years!Yet,our cells simply cannot continue to reproduce (3)endlessly.They wear out,and as a result,we get old and (4)desperately die.
Even though we can't live forever,we are living a (5)longer life than ever before.In 1900,the average American life span (寿命) was only 47years,but today it is 75years!
When does old age begin then?Sixty-five may be out-of-date as the (6)dividingline between middle age and old age.After all,many older people don't begin to experience physical and mental (7)declineuntil after age 75.
People are living longer because more people (8)enjoy childhood.Before modern medicine changed the laws of nature,many children died of common childhood (9)problems.Now that the chances of dying (10)enjoy are much lower,the chances of living long are much higher due to better diets and health care.
On the whole,our population is getting older.The(11)changes in our population will have lasting effects on our social development and our way of life.Some people fear such changes will be for the worse,while some see(12)chances,not disaster,many men and women in their"golden years"are healthy,still active,and young in (13)mind if not in age.
As the society grows old,we need the (14)permission of our older citizens.With long lives ahead of them,they need to (15)turn active and devoted.

1.A.designedB.selectedC.improvedD.discovered
2.A.completelyB.generallyC.apparentlyD.extremely
3.A.rapidlyB.harmlesslyC.endlesslyD.separately
4.A.eventuallyB.hopelesslyC.automaticallyD.desperately
5.A.busierB.longerC.richerD.happier
6.A.finishingB.guidingC.waitingD.dividing
7.A.stressB.damageC.declineD.failure
8.A.surviveB.enjoyC.rememberD.value
9.A.problemsB.fearsC.worriesD.diseases
10.A.poorB.youngC.sickD.quiet
11.A.changesB.recoveryC.safetyD.increases
12.A.dreamsB.chancesC.strengthsD.choices
13.A.mindB.appearanceC.voiceD.movement
14.A.protectionB.suggestionsC.contributionsD.permission
15.A.soundB.appearC.turnD.stay.

分析 本文是一篇说明文.话题围绕人类的寿命展开.人的寿命是有限的,随着社会的发展,生活水平的提高,人们的寿命比以前更长了,而且老龄化已经成了社会的一个趋势,我们的社会需要这些老年人们继续保持积极的心态,为社会做贡献.

解答 1.A   考查动词辨析  根据句意可知,科学家们认为人体的结构设计决定了人类最多不会活过120岁.故选A.
2.D   考查副词辨析   根据上下文可知,此处表示110岁很可能是任何一个人可能会希望活的最长的年龄---如果一个人非常的健康和幸运,人们希望能活到110岁,故选D.
3.C   考查副词辨析   根据句意可知,这里表示人类细胞不能永远无止境地自我繁殖,所以人才会变老.故选C.
4.A   考查副词辨析    根据语境可知,get old 的最终结果就是死亡,所以用eventually表示"最终".故选A.
5.B   考查形容词比较级辨析   根据上下文的语境可知,美国人的平均寿命从47岁增长到75岁,B项符合语境,故选B.
6.D   考查形容词辨析.根据句意可知,把65岁当做中年和老年的分界线,这已经不适合现在的形势了.dividing line分界线,故选D.
7.C   考查名词辨析.根据上文提到的65岁作为中年和老年的分界线已经过时了,再结合空后的"until after age 75"可知,现在很多老年人是在75岁之后身体和精神才开始衰弱的,故选C.
8.A   考查动词辨析.根据这一段的内容和the chances of living long are much higher due to a better diets and health care可知,现在的人平均寿命比以前更长的一个原因是人们从童年的疾病中幸存了下来,故选A.
9.D   考查名词辨析.根据上文的"modern medicine"可知,此处选disease符合语境,故选D.
10.B  考查形容词辨析.句意:既然年少夭折的可能性更低了,那么活得更长的机会就更高了,因为有了更好的饮食和医学护理.poor 穷的;young 年轻的;sick 病的;quiet 安静的.根据这一段的意思可知,以前人们在小的时候就因为生病死去了,dying young就是年少死去.故选B.
11.A  考查名词辨析.根据下文中Some people fear such changes will…可知,我们现在的人口结构改变了,故选A.
12.B  考查名词辨析.根据句意可知,这句话中的while 表示对比,即跟前一种人不一样的看法,故选B.
13.A  考查名词辨析.句意:现在,很多处在"黄金年龄"的男士和女士,身体都非常健康,仍然积极,心态也很年轻.mind 心态;appearance 外表;voice 声音;movement移动.根据句意可知,这里应该是说虽然年龄老了,但是心态依然年轻,故选A.
14.C  考查名词辨析.句意:随着我们的社会老龄化,我们需要这些老年公民们的贡献.protection 保护;suggestions 建议;contributions 贡献;permission允许.根据文意可知,现在的社会逐渐老龄化,因此老年人也要继续给我们的社会做贡献,故选C.
15.D  考查动词辨析.句意:前面还有很长的寿命,他们需要保持积极的心态和奉献的精神.sound 听起来;appear 好像;出现;turn 转,变成;stay保持.根据文意可知,现在人们的寿命更长了,因此老年人也要继续保持积极心态,为我们的社会做贡献.故应选D.

点评 解答此类题目可遵循以下步骤:第一步,通读全文,了解文章大意,获得整体印象,同时初选出一批较有把握的答案.第二步,边核对初选答案边补填留下的空格.如果短文难度较大,则可复读几遍,核对和确定答案.有些空一时决定不了,可作个记号,待复查时再确定. 第三步,复查定稿.从整体理解角度出发,仔细审核答案,确保意义上、语法上没有错误,同时对遗留下来的少数几个空格作最后选择.

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