精选优质文档-倾情为你奉上完形填空1From 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 kinds 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_
