题目

下列变形符合等式性质的是( ) A . 如果2x－3=7，那么2x=7－3 B . 如果3x－2=x+1，那么3x－x=1－2 C . 如果－2x=5，那么x=5+2 D . 如果－x=1，那么x=－3 答案：DMy brother and I often fight with each other over small things. One day our father said to us, “Tomorrow we will take part in the Ray Home Sports Day. Both of you must go with me. Perhaps you can learn something from those children.” My brother laughed, “Dad, Ray is a home for physically disabled children. What can we learn from them?” “You will see,” our father said.Our father works as a volunteer at Ray. The children there have problems with their hands, speech, walking or hearing. Every day, he spends hours helping them to move or exercise their legs or arms.The following day, he took us to Ray Home. When we got there, we found a nice place to sit down. Finally, the sports began. There was a 50-meter race to see who could run fastest. All the runners were physically disabled. As the race started, all the children moved as fast as they could. Just then, one of the girls fell over and hurt her leg. She began to cry at the top of her voice.All the children stopped to help the poor girl. Then they all held hands and finished the race together. My brother and I were surprised to see this: the children weren’t interested in winning the race－they were more interested in helping each other to finish the race.【1】Why did the father take the writer and his brother to Ray Home?A．The father wanted them to do something at Ray.B．The father asked them to help the children at Ray.C．The father wanted them to take part in the Sports Day.D．The father wanted them to learn something from the children.【2】Why did all the children stop in the 50-meter race stop?A．All the children were disabled.B．A little girl fell over and got hurt.C．They stopped to laugh at the girl.D．They didn’t want to finish the race.【3】What can we learn from the passage?A．The children there can help each other.B．All the runners there can not run fast.C．All the children don’t want to be winners.D．The disabled children there were not smart enough.