回答下列各题 He saw the old lady and her car on the sideof the road．Hecould see she needed help．So he pulled up in front ofher car and got out． Even with the smile on his face．she was worried．He didn’t look safe．He looked poor and hungry． He said．“I’m here to help you，ma’am．My name is Bryan Anderson．” All she had was a flat tire(瘪胎)，but for an old lady，that was bad enough．Bryan changed the tire and she couldn’t thank him enough for thehelp．Then，the lady asked howmuch she owed him．She had already imagined all theterrible things that could have happened．He told herthat if she really wanted to pay him back，the next timeshe saw someone who needed help，she could give thatperson the help they needed． A few miles down the road，the lady saw a small caf6．She went in．The waitress came over with asweet smile．one that even being on her feet for thewhole day couldn’t erase．She noticed thewaitress was nearly eight months pregnant(怀孕)，but she never let her aches be noticed．The oldlady wondered how someone who had so little could be so giving to a stranger．Then，she remembered Bryan． After her meal，the lady paid with a one hundred dollar bill．The waitress quickly went to get change．butwhen she came back，she noticed something written on thenapkin(餐巾纸)with the words saying：“You don’t owe me anything．Somebody oncehelped me out，the way Im helping you．If you really want to pay me back，here iswhat you d0：Do not let this chain of love end with you．” Under the napkin were four more$100 bills． That night when the waitress got home，she was thinking aboutwhat the lady had written．How could the lady have knownhow much she and her husband needed the money with the baby due next month? Asshe lay sleeping next to her husband，she whispered softand low，“Everything’s going to be all right．I love you，Bryan Anderson．” Why was the old ladyworried when Bryan tried to help her?