A. A feudal manorial lord caste.

　　B. The appearance of buying, selling and renting of land.

　　C. The rule of Mu family in Lijiang.

　　D. The establishment of Lijiang Prefecture.

　　答案与解析：B　从文章最后一段可知，the landlord economy的开始是以"buying, selling and renting of land began to take place"为标志的。

　　5．What is the best title of the passage?

　　A. The Mu family

　　B. The history of Lijiang Prefecture

　　C. The history of the Naxi Ethnic Group

　　D. The rulers of Naxi

　　答案与解析：C　通读全文可知，文章主要讲述了纳西族的历史。

　　B

　　Canyonlands National Park

　　Canyonlands National Park is a famous tourist attraction in Utah where visitors can see arches(拱门) and other beautiful rock formations.

　　Canyonlands National Park is a wild, lonely area of rocks, rivers and desert plants. Only Native Americans, cowboys, and explorers entered this area before the park was set up in 1964.Even today, it is difficult to walk or ride through the park. The roads are still made of dirt. Driving requires a special vehicle. The National Park Service says Canyonlands National Park is wild America.

　　Rivers created the area as they cut rocks into many different formations. At the center of the park are two deep canyonlands carved by the Green and Colorado Rivers. Three areas that surround these rivers are included in the park.

　　One of these areas is called the Maze District. This area includes rock art made by people who lived there more than 2,000 years ago. Yet many people today cannot see the Maze District because it is so difficult to reach. The area is one of the loneliest and wildest areas in the United States.

　　Another area of the park is called the Needles. It includes long, thin, red and white rocks that reach high into the air like fingers on a hand.

　　A good way to see all the areas of Canyonlands National Park is to fly over it. A one­hour trip in a small airplane makes it possible to see the park's red rocks, arches and flat areas where ancient Indian people once lived.

　　From high in the air, visitors can clearly see the third area of the park­a high broad flat rock known as the Island in the Sky. The island was formed between the two rivers.

　　Another interesting formation is called the Upheaval Dome. This is a huge hole about four hundred and fifty meters deep and one point five kilometers wide. It is considered to be the most unusual geological(地质的) structure in the area.

　　6．Why is Canyonlands National Park referred to as wild America?

　　A. No vehicle is available to go through the park.

　　B. The park today still remains as it was in the past.

　　C. There is no access for people to get close to it.

　　D. A variety of wild animals and plants grow in it.

　　答案与解析：B　根据第二段中的内容可知，美国犹他州的峡谷地国家公园(Canyonlands National Park)路况原始、交通不便，是人迹罕至的地方，基本保持原有风貌，因此被称为"wild America"。

　　7．What do we know about the Maze District?

A. No one is allowed to explore the area.