题目内容：
根据下列材料，回答题Play is the principal business of childhood,and more andmore in recent years research has shown the great importance of play in the development，of a human bein9．From earliest infancy，every child needs opportunity and the right material for play，and the main tools of play al'g toys．Their main function is to suggest，encourage and assist play．To succeed in this they must be good toys，which children will play often，and will come back to again and again．Therefore it is important to choose suitable toys fbr different stages of a child’s development．
In recent years’research on infant development has shown the standard a child is likely to reach，within the range of his inherited 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 underestimated．A babv who is encouraged and stimulated，talked to and shown things and played with,has the best chance of growing up successfully．
The next stage，from three to five years old，curiosity knows no bounds．Every type of suitable toys should be made available to the child，for trying out，experimenting and learnin9，for discove ring his own particular ability．Bricks and jigsaws and construction toys；paintin9，scribbling and making things；sand and water play；toys for imaginative and pretending play；the fn-st social games for learning to play and get on with others．
By the third stage of play development--from five to seven or eight years—tlle child is at schoo1．But for a few more years play is still the best way of learnin9，at home or at sch001．It is easier to see which type of toys the child most enjoys．
Until the age of seven or eight，play and work mean much the same thing to a child．But once reading has been mastered，then books and school become the main source of learnin9．Toys are still interesting and valuable，they lead on to new hobbies．but their significance has changed to a child of nine or ten years，toys and games mean，as to adults，relaxation and fun．
The writer wants us to understand that a child_____． A．has to be taught how to play
B．likes a toy
C．matures through play
D．can grow up with toys
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