题目内容：

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.

Tour the City on Foot

When touring the city by walking, you aren’t going to walk much. What’s more, there are far more benefits. This kind of tour allows you to see as many buildings of the city as possible. A tour of the city on foot usually focuses on a more localized neighborhood level, which can be very interesting in a number of different ways.

Hit the Waters of San Francisco Bay

The waters of San Francisco Bay have played an important role in the city s development over the last century, Touring San Francisco from the water is a completely unique way for you to see this wonderful city.

Take a Bus Tour

If you want to see a wide variety of attractions from all over the city, one of the best things you could do is to book a tour through our company that offers services here. A bus tour of San Francisco is one of the most complete ways to experience the city

Tour San Francisco From the Air

While it is one of the most expensive ways to see San Francisco, touring the city from the air is one of the most unique and thrilling ways to see the city. Seeing the city from high above allows you to get a full view of the city as tour guides point out attractions from high above. If you do decide to tour San Francisco by air, you’ll be creating memories that you won’t forget forever.

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1.How should you tour San Francisco to appreciate its buildings?

A. By air    B. By bus.    C. On foot    D. By boat

2.What can we learn about the Waters of San Francisco Bay?

A. They have high quality sea water.

B. They are explored on a localized level.

C. They were not in use until the last century.

D. They have helped the city to develop further.

3.Which tour cost most?

A. Tour San Francisco From the Air    B. Hit the Waters of San Francisco Bay

C. Tour the City on Foot    D. Take a Bus Tour

4.What is the author’s purpose in writing the text?

A. To introduce San Francisco.

B. To advertise for a travel agency.

C. To show what to do in San Francisco.

D. To persuade people to visit San Francisco.