Play is the principle business of childhood, and more and more in recent years’ research has shown the great importance of play

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问题     Play is the principle business of childhood, and more and more in recent years’ research has shown the great importance of play in the development of a human being. From earliest infancy, every child needs【B1】______ and the right material for play, and the main【B2】______ of play are toys. Their main function is to suggest, encourage and【B3】______play. To succeed in this they must be good toys, which children will play with often, and will come back to again and again. Therefore it is important to choose toys for different stages of a child’s development.
    Recent years’ research on【B4】______ development has shown the standard a child is likely to reach, within the range of his【B5】______ abilities, is largely determined in the first three years of his life. So a baby’s ability to profit from the right play materials should not be【B6】______. A baby, who is encouraged and【B7】______, talked to and shown things and played with, has the best chance of growing up 【B8】______.
    The next stage, curiosity knows no bounds. Every type of suitable toy should be made available to the child,【B9】______. Until the age of seven or eight, play and work mean much the same to child. 【B10】______. Toys are still interesting and valuable, they lead on to new hobbies, but their significance has changed—【B11】______
【B6】

选项

答案underestimated

解析 根据空格前面的be,可知此处需要一个形容词或名词作表语,或者动词的过去分词表示被动语态。underestimate表示“低估”,过去分词形式是在词尾加-d。
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