全新版大學(xué)英語聽說教程第三冊聽力原文unit-文庫吧資料
2024-11-10 10:18本頁面
【正文】 y dominant over the other. Statements: 1. At 12 weeks, both hands bee dominant. 2. By 24 weeks, right hand bees dominant. 3. By 36 weeks, left hand bees dominant. 4. Between 40 and 44 weeks, both hands bee dominant. 5. At 48 weeks, left hand bees dominant. 6. Between 52 and 56 weeks, both hands bees dominant. 7. At 80 weeks, both hands bee dominant. 8. At the age of two, right hand bees dominant. 9. Between two and a half and three years, both hands bee dominant. 10. By the age of eight, one hand is strongly dominant over the other. Part D Brain Organization and Handedness Scientific studies during the 1970s and early 1980s suggested that differences in left and righthanders39。Unit 8 Part B Text 1 Why Are Some People Lefthanded? Research has shown that 90% of people naturally use their right hands for most tasks. But hundreds of millions of people use their left hands. Then why are some people lefthanded? Scientists have been trying to answer that question for many years. A study done in 1992 found that men are more likely to be lefthanded than women. It also found that Asian or Hispanic people are less likely to be lefthanded than white people, black people or North American Indians. Some cultures accept people who do things mostly with their left hands. Others do not. Scientists want to know the reason for lefthandedness because it is closely linked to mental problems and language difficulties. One idea about the cause
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