题目

“Make-A-Wish” is o【1】 of the world’s most well-known charities (慈善机构). It makes wishes come true for children who have some illnesses. It gives them hope and helps them forget about their h【2】 problems.Christopher was a 7-year-old boy, he was very sick. He always dreamed of becoming a pilot to fly in the sky. They gave Christopher a tour of the city in a police helicopter and b【3】 a space helmet (头盔) for him.There are four kinds of wishes children usually have:I wish to go.Children u【4】 want to visit some places of interest, like the Statue of Liberty.I wish t求圆C：（x-1）2+（y+1）2=2上的点与直线x-y+4=0距离的最大值和最小值．