【導(dǎo)讀】Chancesare,ifyou. 的Thisfrightening. marshland.depleted.

　　

【正文】 o have discovered a trend in monkeys towards the asymmetry that is evident in the human brain. 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 anisation 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 中國(guó)最大的管理資源中心 (大量免費(fèi)資源共享 ) 第 17 頁(yè) 共 21 頁(yè) 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. 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 `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, `it is no coincidence that lefthand, often develop a stammer as they are 中國(guó)最大的管理資源中心 (大量免費(fèi)資源共享 ) 第 18 頁(yè) 共 21 頁(yè) 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. Questions 17 Use 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 Broca B Dr Brinkman C Geschwind and Galaburda 中國(guó)最大的管理資源中心 (大量免費(fèi)資源共享 ) 第 19 頁(yè) 共 21 頁(yè) D Charles Moore E Professor Turner Example Answer Monkeys do not show a species specific preference for B Left or righthandedness. 1 Human beings started to show a preference for righthandedness when they 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 quickly than righthanded people. 5 People who suffer strokes on the left side of the brain usually lose their 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 810 Using the information in the passage, plete the table below. 中國(guó)最大的管理資源中心 (大量免費(fèi)資源共享 ) 第 20 頁(yè) 共 21 頁(yè) Write your answer in boxes 810 on your answer sheet. Percentage of children lefthanded One parent lefthandedOne parent righthanded …(8)… Both parents lefthanded …(9)… Both parents righthanded …(10)… Question 1112 Choose the appropriate letters AD and write them in boxes 11 and 12 on your answer sheet. 11 A study of monkeys has shown that A 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 Keys Unit 2 中國(guó)最大的管理資源中心 (大量免費(fèi)資源共享 ) 第 21 頁(yè) 共 21 頁(yè) Unit 3 Unit 4 Unit 5 Passage1 8. 1520% 9. 40% 10. 6% 11. D 12 B