No one really knows what makes a person become right-handed instead of left-handed. Scientists have found that almost 40% of the people become left-handed because their main brain is damaged when they are born. However, this doesn’t happen to everyone, so scientists guess there must be another reason why people become left-handed. One idea is that people usually get right-handed from their parents. If a person does not receive the gene(基因) for right-handedness, he / she may become either right-handed or left-handed according to the chance and the people they work or live with.

　　Though right-handedness is more common than left-handedness, people no longer think left-handed people are strange or unusual. A long time ago, left-handed children were made to use their right hands like other children, but today they don’t have to.

　　56. After studying works of art made at different times in history, the scientists found _______.

　　A. the art began from 1,500 B.C.

　　B. the works of art ended in the 1950s

　　C. most people shown in the works of art are right-handed

　　D. most people shown in the works of art are left-handed

　　57. How many people in the world are left-handed now?

　　A. Less than one sixth. B. More than a half.

　　C. About 40%.

　　D. The passage doesn’t tell us.

　　58. What is the hand for most people used to do?

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