3．What do Lenordo da Vinci，Paul McCartney，and Albert Einstein have in common？They were all left-handed，along with other famous people including Pablo Picasso，Prince William，and Marilyn Monroe．In fact，an estimated 11percent of Americans and Europeans are left-handed．
Most people around the world are right-handed．This fact also seems to have held true throughout history．In 1997，scientists studied works of art made at various times history starting with cave drawings from 15，000B．C．and ending with paintings from the 1950s．Most of the people shown in these works of art are right-handed，so scientists guessed that right-handedness has always been common．
Many researchers claim to have found relationships between left-handedness and various physical and mental characteristics，such as blond hair，blue eyes，vegetarianism，and sleep difficulties．Other studies have found a higher-than-normal level of left-handed people in certain occupations，including professional baseball and tennis players，architects，lawyers，as well as prisoners．However，some of these connections are very weak，and others haven't been proven．
What makes a person become right-handed rather than left-handed？As yet，no one really knows for sure．One simple idea suggests that people normally get right-handedness from their parents．Studies have found that two right-handed parents have only a 9.5percent chance of having a left-handed child，whereas two left-handed parents have a 26percent chance of having a left-handed child．Another common theory is that left-handed people suffer mild brain damage during birth，which makes them left-handed．However，if this theory were true，it wouldn't explain why the percentage of left-handed people is so similar in every society，when birth conditions vary so much from society to society．
Whatever the reasons behind it，people's attitudes toward left-handedness have changed a lot over the years．Statistics show that although 13percent of young people （10-20years old） are left-handed，only 6percent of the elderly are left-handed．Left-handed children used to be punished until they began using their right hand like other children，but today people who are left-handed are no longer looked down on nor are they considered abnormal．For most people today either case is perfectly acceptable．There are even a number of shops now that specialize in selling products designed for left-handed people，such as left-handed scissors，can openers，guitars，and even a left-handed camera．
In 1976，Left-Handers International，a group of left-handed people in Topeka，Kansas，in the United States，decided to start an annual event in order to clear up misunderstandings about left-handedness．They decided that August 13th is International Left-Handers Day，and to this day groups of left-handed people around the world celebrate their own special day．

45．What does the third paragraph describe？C
A．why people with certain characters are better at certain jobs
B．reasons why left-handed people are better at some jobs
C．links between left-handedness and certain occupations and characteristics
D．why people are left-handed
46．What makes a person right-handed？D
A．the person's parents                 B．society
C．the person's birth                   D．The reason is uncertain
47．What can be assumed about the children of two left-handed parents？B
A．Most of them are left-handed．B．Most of them are right-handed
C．Most of them use both hands equally．D．Very few of them are right-handed．
48．Today，only 6percent of the elderly are left-handed because left-handed people…D
A．can be treated by doctors today．B．die younger．
C．are thought of as abnormal．D．were often forced to become right-handed．

分析 本文講述在世界上多數(shù)人時右手使用者，科學家從歷史美術作品中也得到這種結果，就此科學家們針對為什么右手使用者比左手使用者多作的一些發(fā)現(xiàn)和推測．

解答 45-48 CDBD
45．C．細節(jié)理解題．根據(jù)本段開頭一句Many researchers claim to have found relationships between left-handedness and various physical and mental characteristics以及后面一句Other studies have found a higher-than-normal level of left-handed people in certain occupations可知，本段的主要內容是探討的左手和特定職業(yè)以及性格的關系；故選C．
46．D．細節(jié)理解題．根據(jù)第四段中What makes a person become right-handed rather than left-handed？As yet，no one really knows for sure．可知，至于人們?yōu)槭裁戳晳T使用右手其原因是不為人知的，故選D．
47．B．推理判斷題．根據(jù)第四段中Studies have found that two right-handed parents have only a 9.5percent chance of having a left-handed child，whereas two left-handed parents have a 26percent chance of having a left-handed child可知，父母都是習慣使用右手，他們孩子為左撇子的幾率為9.5%；而父母同時都是左撇子的，孩子為左撇子的幾率為26%，由此可推斷B項為正確選項．
48．D．細節(jié)理解題．根據(jù)第五段Left-handed children used to be punished until they began using their right hand like other children可知，習慣用左手的孩子經常受到懲罰直到他們改為使用右手；故選D．

點評 閱讀理解題通常從細節(jié)，文章主旨，推測詞組大意幾個方面考查學生對文章的理解，做題時注意找到文章出處，做到有理有據(jù)．

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