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's future 3 and cultural growth increased.
　　Many linguists believe that evolution is 4 for 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 is necessary 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.feasibility C.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
　　第六篇答案+解说：
　　1.「答案」B
　　「解析」此处意为：当人类刚刚开始进化，他们如同新生儿一样不会运用语言这种工具。
　　evolved逐渐发展，进化符合题意。generated生殖，发展；born （bear的过去分词）不能作谓语动词；originated起源，不能用first修饰。
　　2.「答案」A
　　「解析」根据语法分析，答案应用来修饰语言的。valuable珍贵的；appropriate合适的，适当的；convenient方便的，便利的；favorite喜欢的。语言并不是人类选择的结果，而是人类在进化过程中慢慢发展起来的，对人类来说，应当是珍贵的。
　　3.「答案」A
　　「解析」此处意思是：语言的发展增加了人类未来的成就和文化进步的可能性。attainments成就；feasibility可行性；entertainments娱乐；evolution进化。
　　4.「答案」D
　　「解析」此处意为：许多语言学家认为进化使人们产生和具备了语言的能力。固定短语be responsible for对……负责，是……的原由。其它选项不与for搭配。
　　5.「答案」C　　「解析」根据语法分析，空格后应是一个宾语从句，而A，B，D三项后都不能接从句做直接宾语。confirm（确认）+名词；inform（通知）sb.of sth.；convince（使某人确信） sb.of sth.
　　6.「答案」D　　「解析」固定搭配provide sb.with sth.意为“向（人）提供（物）”
　　7.「答案」B
　　「解析」此处意为：我们高度发达的大脑是我们具备了其它低等动物所不具备的语言能力。显然，这里是把人和低等动物相比较。因此选organisms有机体，生物体。
　　8.「答案」A　　「解析」此句意思是：人类的语言能力是与生俱来的，但语言本身也在逐渐发展，所以这种能力应该是潜在的。potential潜力；performance履行；preference偏爱；passion激情。
　　9.「答案」A　　「解析」此句句义是：语言本身作为童年时期大脑生长的一种功能，其发展是缓慢的。as （作为，当作）合乎题意。Like作为介词的意思是“像……一样”。