阅读理解

     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.

复数z=1﹣i，则$\stackrel{-}{z}$对应的点所在的象限为（　　）

— What can I do for you, madam?

—I want        some cakes        my parents.

已知点P在曲线C₁：$\frac{x^2}{16}-\frac{y^2}{9}=1$上，点Q在曲线C₂：（x﹣5）²+y²=1上，点R在曲线C₃：（x+5）²+y²=1上，则|PQ|﹣|PR|的最大值是（　　）