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【正文】 t are involved with the production of speech are usually larger on the left side than on the right. Since monkeys have not acquired the art of speech, one would not expect to see such a variation but Brinkman claims to have discovered a trend in monkeys towards the asymmetry that is evident in the human brain.161。161。161。161。Two American researchers, Geschwind and Galaburda, studied the brains of human embryos and discovered that the leftright asymmetry exists before birth. But as the brain develops, a number of things can affect it. Every brain is initially female in its organisation and it only bees a male brain when the male foetus begins to secrete hormones. Geschwind and Galaburda knew that different parts of the brain mature at different rates。 the right hemisphere develops first, then the left. Moreover, a girl39。s brain develops somewhat faster than that of a boy. So, if something happens to the brain39。s development during pregnancy, it is more likely to be affected in a male and the hemisphere more likely to be involved is the left. The brain may bee less lateralised and this in turn could result in lefthandedness and the development of certain superior skills that have their origins in the left hemisphere such as logic, rationality and abstraction. It should be no surprise then that among mathematicians and architects, lefthanders tend to be more mon and there are more lefthanded males than females.161。161。161。161。The results of this research may be some consolation to lefthanders who have for centuries lived in a world designed to suit righthanded people. However, what is alarming, according to Mr. Charles Moore, a writer and journalist, is the way the word 39。right39。 reinforces its own virtue. Subliminally he says, language tells people to think that anything on the right can be trusted while anything on the left is dangerous or even sinister. We speak of lefthanded pliments and according to Moore, 39。it is no coincidence that lefthand, often develop a stammer as they are robbed of their freedom of speech39。. However, as more research is undertaken on the causes of left handedness, attitudes towards lefthanded people are gradually changing for the better. Indeed when the champion tennis player Indeed when the champion tennis player Ivan Lendl was asked what the single thing improve his game, he said he would like to bee a lefthander.161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。161。Geoff Maslen170。171。Questions 17Use the information in the text to match the people ( listed AE ) with the opinions ( listed 17 ) below. Write the appropriate letter ( AE ) in boxes 17 on your answer sheet. Some people match more than one opinion.A Dr BrocaB Dr BrinkmanC Geschwind and GalaburdaD Charles MooreE Professor TurnerExample AnswerMonkeys do not show a species specific preference for BLeft or righthandedness.1. Human beings started to show a preference for righthandedness whenthey first developed language.2. Society is prejudiced against lefthanded people.3. Boys are more likely to be lefthanded.4. After a stroke, lefthanded people recover their speech more quicklythan righthanded people.5. People who suffer strokes on the left side of the brain usually losetheir power of speech.6. The two sides of the brain develop different functions before birth.7. Asymmetry is a mon feature of the human body.Question 810Using the information in the passage, plete the table below. Write your answer in boxes 810 on your answer sheet.Percentage of children lefthandedOne parent lefthandedOne parent righthanded ...(8)...Both parents lefthanded ...(9)...Both parents righthanded ...(10)...Question 1112Choose the appropriate letters AD and write them in boxes 11 and 12 on your answer sheet.11 A study of monkeys has shown thatA monkeys are not usually righthanded.B monkeys display a capacity for speech.C monkey brains are smaller than human brains.D monkey brains are asymmetric.12 According to the writer, lefthanded people.A will often develop a stammer.B have undergone hardship for years.C are untrustworthy.D are good tennis players.Answer KeysUnit 21. F Unit 31. F Unit 41. T Unit 51. F Passage18. 1520%9. 40%10. 6%11. D12. B