B．To advertise for a travel agency.

　　C．To show what to do in San Francisco.

　　D．To persuade people to visit San Francisco.

　　B　[推理判断题。根据第一段"The city of San Francisco is a wonderful tourist attraction that offers many different things to see and do.The best way for a traveler to get a good look at the city is to take one of the many different tours there."可知，作者写这篇文章的目的是为旅行社登广告。故选B。]

　　B

　　David Brown and Anne are two patients in the Adult Day Care Program at Mercy Hospitals.David Brown is seventy­two years old.He's friendly and likes to talk.He lives with his wife in the city.But David is becoming forgetful.His wife says, "He'll heat up some soup, then forget to turn off the gas." She is sixty­one and still works.She is worried about leaving her husband alone.

　　Anne is eighty and lives with her 60­year­old daughter.Her daughter says that she needs a rest."Mom follows me everywhere.She follows me when I read newspapers.I need a rest and she does, too."

　　And so, several times a week, David and Anne's families take them to the Adult Day Care Center.Many hospitals have this program, Patients come to the Center for a full or half day, from one to five days a week.All the patients live with their families and most are old people.

　　Mrs.Carol Johnson is the director of the Center.She says, "We help the patients learn many things here.Patients have the chance to get out of their houses.Husbands, wives or grown children can work or have a rest.Most important of all, families are able to stay together."

　　【语篇解读】　本文是一篇说明文。文章介绍了美国的the Adult Day Care Program。

　　5．What happens to Anne's family?

　　A．Anne cleans all the rooms every day.

B．Her daughter is too old to look after her.