B

    Fraser is four years old. He has autism(自闭症). He lives in his own world. Everything is very difficult to him. He doesn't want to play with other children. He doesn't want to say any words to others. His parents are worried about him.

    Then Billy, a cat, comes. It helps Fraser go out of his world.

When Billy sees Fraser, it runs to him quickly. It sits beside Fraser with its paws on Fraser's legs. They seem to be old friends. Fraser says, "This is our cat. He can come to live with us." "I know our life changes," says Fraser's mother.

    Billy stays with Fraser all the time. They play together, listen to the story together and sleep together. When Fraser walks in the garden, Billy is never far away. When Fraser is unhappy, it always lies beside him.

    It seems crazy. But Billy is like Fraser's angel. Fraser changes a lot. The doctor says he is getting better. He doesn't have to see the doctor now.

一短跑运动员在 5s 内跑完了 50m，汽车行驶的速度是 54km/h，羚羊奔跑的速度是 20m/s， 那么三者速度从小到大的顺序是 （   ）

我国新疆天山和昆仑山脉之间的绿洲属于（　　）