题目

阅读理解 My name is Lucy and this is my grandfather. His name is Tim and he is my best friend. My grandfather is 64 years old and he is retired now, so he has much time to play with me. I love him and he loves me.He lives with my father, my mother and my brother Kevin and me. We live in a big house. My grandfather is a very tall and strong man! Can you see me on his shoulders (肩膀)in this photo? He is still very healthy and strong! My grandfather always knows what I want to do or eat or what I feel! When I am sad, he makes me laugh with his funny faces. Every night before I go to bed, 一根钢管，如果截去它的40%后，还剩2.4米；如果截去它的13，还剩多少米？