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Which of your two hands do you use most? Very few of us can use 1 of our hands equally(同等的) well. Most of us are right-handed. Only about five people 2 a hundred are left-handed. New-born babies can grasp(抓)objects with 3 of their hands, but in about two years they usually p refer to use their 4 hands. Scientists don't know why this 5 . Monkeys are our 6 relatives(亲戚)in the animal world. Scientists have found that monkeys prefer to use one of their hands more than the 7 -but it can be either hand. There are as many right-handed monkeys as left-handed 8 . Next time you visit the zoo, 9 the monkeys carefully. You'll see that some of them will prefer to use their right hands when they swing(荡秋千), and others will use their left hands. But most human beings(人类)use their right hands better and this ma  kes life 10 for those who prefer to use their left hands. In fact we live in a right-handed world. | ||||
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