填写所缺单词

填写所缺单词
which of your hands do you often use most?Very few of us use both ofour hands well.most of us are righthanded .o[ ] about 5 people out of a hundred are lefthanded .newborn b[ ] can take things with either of their hands ,but i[ ]about 2 years they like to use their right hands.scientists don't know why this h[ ].they have studied i[ ].they think our animal ancestots righthanded,but this may not be true.monkeys are our c[ ] relationsin animalworld.scientists have f[ ]that animals like to use one of their hands more than the other ,but it can be either hand.there are so many righthanded o[ ].next time you visit the zoo,w[ ]the monkeys carefully.you will see that some of them swing from their right hands and others will use their left hands.b[ ]most human beings use their right hands butter and this makes lifev difficult for the lefthanded ones.we live in a righthands world.