阅读答问。 阅读下面的材料，然后根据材料内容回答问题。
Annie lived alone in Chicago. One day, she fell down in her bedroom and broke her leg. So she tried to call her friend Lisa. But she dialed(拨打) a wrong number. The call reached Taylor, an 18-year-old girl. She was a college student and she lived hundreds of miles away from Chicago.
At that time Taylor was reading in bed. She thought it was somebody playing a joke. When she was going to hang up the phone, she heard a woman saying “Help! Help! ” From it Taylor thought something bad must have happened to the woman. After she got the woman’s name and address, Taylor called 911 at once. Then she tried to make Annie feel comfortable. She spoke to Annie on the phone till the doctors arrived at Annie’s house. At last Annie was taken to hospital in time.
As soon as Annie felt better, she wrote a letter to Taylor to thank her.
Who answered the telephone?                                           
How did Taylor help Annie?                                            
Why did Annie write the letter to Taylor?