题目

“If you want to see a thing well, reach out and touch it!” That may seem a strange thing to say. But touching things can help you to see them better. Your eyes can tell you that glass ball is round. But by holding it in your hands, you can feel how smooth and cool the ball is. You can feel how heavy the glass is. When you feel all these about the ball, you really see it. With your skin, you can feel better. For example, your fingers can tell the difference between two coins in your pocket. You can feel a little drop of water on the back of your hand, too. You can even feel sounds agai 用计算器计算. 5003-730= 9827+598= 106×48= 28×36=
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