In 1966 Allen and Beatrice Gardner, two psychologists at the University of Nevada in Reno, had a bright idea. They were interested in the evolution of language and the linguistic capabilities of great apes. Previous attempts to teach chimpanzees to talk had ended in failure and the matter was considered by most people to be closed. But the Gardners realised that speech and language are not the same thing. Many deaf people, for example, are unable to speak but are perfectly able to communicate by gestures that have all the attributes and sophistication of spoken language. Given the very different anatomies of the human and chimpanzee larynx, the Gardners suspected that previous experiments had failed because chimps are physically incapable of speech.
They therefore decided to try teaching a chimpanzee to sign in the way that deaf people do. And their chosen subject, a female chimp named Washoe after the county in which the university campus is located, proved an adept pupil. Though there is still debate about whether what Washoe learned was really equivalent to human language, there is no doubt that she learned a lot of words. She now has a vocabulary of about 200. All of this, however, raises a second question. If Washoe and her successors can learn a complex and arbitrary vocabulary of gestures from people, do they have such vocabularies naturally? To examine that possibility Amy Pollick and Frans de Waal, of Emory University in Atlanta, Georgia, have looked at gestures and expressions in chimpanzees and their cousins, bonobos.
Signalling by facial and vocal expression is ubiquitous among primates. Signalling by gesture is confined to the great apes. The researchers' hypothesis was that the meaning of expressions has been hard-wired by evolution whereas the meaning of gestures is learnt and, at least to some extent, is arbitrary. If that were true, particular sorts of facial and vocal expression would occur only in particular contexts, and that this would be consistent across groups and even species. The same gestures, by contrast, would be used in different contexts.
The researchers found exactly what they expected. Expressions (“silent bared teeth”, “relaxed open mouth”, “pant hoot” and so on) almost always occurred in the same contexts in different groups and different species. Gestures (“hard touch”, “reach outside”, “slap ground” etc) did not. Half of the gestures Dr Pollick and Dr de Waal regularly observed seemed to have completely different meanings in the two species. Moreover, even within a single group, the meaning of a gesture could vary with context, almost as tone of voice can vary the meaning of a human's spoken word.
It is also worth remembering that gesture is still a crucial part of human language, even for those with normal hearing. The old joke that the way to render an Italian speechless is to tie his hands together has a kernel of truth in it. Evolution does not come up with complicated structures in a single leap. They are built up step by step. This study suggests that the step of speech may have been built on mental attributes that were acquired millions of years ago when the ancestors of apes and men began to wave meaningfully at each other.
注（1）：本文选自Economist, 03/03/2007
注（2）：本文习题命题模仿对象为2002年真题Text 4。
1． From the first paragraph, we learn that _______.
[A] chimpanzees have no sense of language at all.
[B] the Gardners found a new idea to develop the chimpanzee experiment.
[C] previous experiments failed because they didn’t have clever cimpanzees.
[D] chimpanzees can use gestures like blind people
2． Which of the following statements is TRUE according to the text?
[A] Washoes failed to use signs and gestures.
[B] The vocabulary Washoe learnt is not similar to human language.
[C] The Washoe experiment has enlighted further research.
[D] The Gardners found that Washoe naturally knew how to use gestures.
3． According to the author, gestures are different from facial and vocal expressions in that _______.
[A] gestures are more complicated
[B] gestures are limited to a certain type of species
[C] facial and vocal experessions are more complicated
[D] there is no difference
4． Which of the following best defines the word “hard-wired” (Line 3, Paragraph 3)?
[A] fixed
[B] changed
[C] taught
[D] made
5． The Pollick and de Waa research probably indicates that _______.
[A] the apes are the closest species to human being
[B] normal people do not really need the help of gestures
[C] the great apes naturally have the ability to use gestures
[D] human language may develop from signs and gestures
篇章剖析
本文是一片关于大猩猩语言能力研究的说明文。第一、二段介绍了卡德勒夫妇的研究成果并引出后两位学者对倭黑猩猩的研究；第三段和第四段分别介绍了研究的假设和结果；最后一段进一步阐述了手势对于人类脑力思考进化的影响。
词汇注释
psychologist [psai`kClEdVist] n.心理学家 bonobo [`bEunE9bEu] n. 倭黑猩猩
chimpanzee [`tFimpEn`zi:] n. 黑猩猩 ubiquitous [ju:`bikwitEs] adj.到处存在,普遍
attribute [E`tribjut] n. 属性, 品质, 特征 primate [`praimit] n. 灵长类的动物
sophistication [sE9fisti`keiFEn] n. 复杂，精致 hard-wired adj. 天生的
anatomy [E`nAtEmi] n. 分解，解剖 pant [pAnt] n. 气喘
larynx [`lAriNks] n.[解] 喉 hoot[hu:t] vi. 大声叫嚣, 鸣响
adept [E`dept] adj. 熟练的, 拿手的 render [`rendE] vt. 致使
successor [sEk`sesE] n. 继承者, 接任者