两画家以《安静》为题各画了一张画。一位画家画了一个湖，湖面平静，倒映着远山和湖边的花草，好像一面镜子。另一位画家画了一个激湍直泻的瀑布，旁边一棵小树，树上一个鸟巢，巢里一只小鸟，小鸟在睡觉。后一位画家才真正理解安静的含义。因为他懂得                                                                

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     Linda was a sixteen-year-old girl in Canada. She was feeling bad for several days. Her mother took her to a hospital and the doctors found out that she had cancer.

     Linda's life changed. She began to go to the hospital often for treatment（治疗）, and she also became depressed.

     The hospitals and the doctors were good, but Linda did not have hope herself. Linda's mother called a flower shop close to the hospital. “I want some beautiful flowers for my daughter. She is a teen girl with cancer.” She told the shop owner.

     Later, the flowers arrived. Then Linda saw something unusual. It was a card. It read:Linda, I own (拥有) this flower shop. I had cancer when I was fifteen years old. I am 24 years old now. Good luck. My heart goes out to you.

                                                                              Yours,

                                                                               Alice

     Linda smiled. She finally felt some real hope. She found the will (意志) to 1ive.

     Little things make a big difference. All of us can give little things like kindness, encouragement and hope to others.

某物体做匀速直线运动，由速度公式可知，物体的（）

在铁制品上镀上一定厚度的铜，以下电镀方案中正确的是

以下关于试管婴儿生产技术不存在的是（   ）