(一)

　　From childhood to old age, we all use language as a means of broadening our knowledge of ourselves and the world about us.When humans first 1 , they were like newborn children, unable to use this 2 tool.Yet once language developed, the possibilities for human kind future 3 and cultural growth increased.

　　Many linguists believe that evolution is 4 fo

　　r our ability to produce and use language.They 5 that our highly evolved brain provides us 6 an innate language ability not found in lower 7 . Proponents of this innateness theory say that our 8 for language is inborn, but that language itself develops gradually, 9 a function of the growth of the brain during childhood.Therefore there are critical 10 times for language development.

　　Current 11 of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable. 12 , more and more schools are discovering that foreign languages are best taught in 13 grades.Young children often can learn several languages by being 14 to them, while adults have a much harder time learning another language once the 15 of their first language have become firmly fixed.

　　16 some aspects of language are undeniably innate, language does not develop automatically in a vacuum.Children who have been 17 from other human beings do not possess language.This demonstrates that 18 with other human beings isnecessary for proper language development.Some linguists believe that this is even more basic to human language 19 than any innate capacities.These theorists view language as imitative, learned behavior. 20 , children learn language from their parents by imitating them.Parents gradually shape their child's language skills by positively reinforcing precise imitations and negatively reinforcing imprecise ones.

　　1.A.generated B.evolved C.born D.originated

　　2.A.valuable B.appropriate C.convenient D.favorite

　　3.A.attainments B.feasibilityC.entertainments D.evolution

　　4.A.essential B.available C.reliable D.responsible

　　5.A.confirm B.inform C.claim D.convince

　　6.A.for B.from C.of D.with

　　7.A.organizations B.organisms C.humans D.children

　　8.A.potential B.performance C.preference D.passion

　　9.A.as B.just as C.like D.unlike

　　10.A.ideological B.biological

　　C.social D.psychological

　　11.A.reviews B.reference

　　C.reaction D.recommendation

　　12.A.In a word B.In a sense

　　C.Indeed D.In other words

　　13.A.various B.different C.the higher D.the lower

　　14.A.revealed B.exposed C.engaged D.involved

　　15.A.regulations B.formations

　　C.rules D.constitutions

　　16.A.Although B.Whether C.Since D.When

　　17.A.distinguished B.different

　　C.protected D.isolated

　　18.A.exposition B.comparison C.contrast

　　D.interaction

　　19.A.acquisition B.appreciation C.requirement

　　D.alternative

　　20.A.As a result B.After all

　　C.In other words D.Above all

　　正确答案：BAADC DBAAB ACDBC ADDAC

　　(二)

　　Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars.The atmosphere again acts 1 our protective blanket on 2 .Light gets through, and this is essential 3 plants to make the food which we 4 .Heat, 5 , makes our environments tolerable and some ultraviolet rays(紫外线的) penetrate the 6 .Cosmic(宇宙的) rays of various kinds come 7 the air from outer space, but 8 quantities of radiation from the sun are screened off. 9 men leave the atmosphere they are 10 to this radiation; 11 their spacesuits or the walls of their spacecraft, if they are inside, 12 prevent a lot of radiation damage.Radiation is the greatest known danger to explorers in 13 .Doses of radiation are measured in 14 called"rems(雷目)".We all 15 radiation here on earth from the sun, from cosmic rays and from radioactive minerals.The"16"dose of radiation that we receive each year is about two millirems; it 17 according toswheresyou live, and this is a very rough estimate.Scientists have reason to think 18 a man can 19 far more radiation 20 without being damaged; the figure of 60 rems has been agreed.

　　1.A.for B.with C.on D.as

　　2.A.stars B.sun C.earth D.space

　　3.A.with B.from C.under D.for

　　4.A.use B.live C.eat D.get

　　5.A.again B.also C.besides D.too

　　6.A.environment B.space C.atmosphere D.earth

　　7.A.across B.to C.from D.through

　　8.A.valid B.enormous C.various D.proper

　　9.A.As soon as B.As well as

　　C.As much as D.As possible as

　　10.A.shown B.exposed C.faced D.covered

　　11.A.but B.because C.so D.so that

　　12.A.get B.make C.have D.do

　　13.A.earth B.atmosphere C.space D.environment

　　14.A.pieces B.units C.parts D.elements

　　15.A.receive B.accept C.bring D.catch

　　16.A.conventional B.commonC.general D.normal

　　17.A.shifts B.converts C.modifies D.varies

　　18.A.what B.which C.that D.why

　　19.A.put up with B.keep up with

　　C.come up with D.catch up with

　　20.A.from B.than C.as D.away

　　正确答案：DCDCD CDBAB ADCBA DDCAB

　　(三)

　　Today the car is the most popular sort of transportation in all of the United States.It has completely 1 the horse as a 2 of everyday transportation.Americans use their car for 3 90% of all 4 business.Most Americans are able to 5 cars.The average price of a 6 made car was ,050 in 1950, ,470 in 1960 and up to ,750 7 1975.During this period American car manufacturers set about 8 their products and work efficiency.As aresult, the yearly income of the 9 family increased from 1950 to 1975 10 than the price of cars.For this reason 11 a new car takes a smaller 12 of a family total earnings today.In 1951 13 it took 8.1 months of an average family 14 to buy a new car.In 1962 a new car 15 8.3 of a family annual earnings, by 1975 it only took 4.75 16 income.In addition, the 1975 cars were technically 17 to models from previous years.The 18 of automobile extends throughout the economy 19 the car is so important to American.Americans spend more money 20 keeping their cars running than on any other item.

　　1.A.denied B.reproduced C.replaced D.ridiculed

　　2.A.means B.mean C.types D.kinds

　　3.A.hardly B.nearly C.certainly D.somehow

　　4.A.personal B.personnel C.manual D.artificial

　　5.A.buy B.sell C.race D.see

　　6.A.quickly B.regularly C.rapidly D.recently

　　7.A.on B.in C.before D.after

　　8.A.raising B.making C.reducing D.improving

　　9.A.unusual B.smallest C.average D.biggest

　　10.A.slower B.equal C.faster D.less

　　11.A.bringing B.obtain C.bought D.purchasing

　　12.A.part B.half C.number D.quality

　　13.A.clearly B.proportionally

　　C.percentage D.suddenly

　　14.A.income B.work C.plans D.debts

　　15.A.used B.spent C.cost D.needed

　　16.A.month B.year C.family D.year

　　17.A.famous B.superior C.fastest D.better

　　18.A.running B.notice C.influence D.affect

　　19.A.then B.as C.so D.which

　　20.A.to B.in C.of D.for

　　正确答案：CABAA BBDCC DABAC ABCBB