A
If you'd like to go sightseeing, the following World Heritage Sites may be your best choices.
Jiuzhaigou Valley Scenic and Historic Interest Area
The Jiuzhaigou Valley, which lies in the northern part of Sichuan Province, reaches a height of more than 4,800 meters, with a series of different forest ecosystems (生态系统). There you can enjoy watching excellent waterfalls. Some 140 kinds of birds also live in the valley, as well as a number of endangered plants and animals, the giant panda included.
For more information, please visit http：//whc.unesco.org//en/list/637.
Khami Ruins National Monument
The city of Khami, which developed after the capital of Great Zimbabwe had been given up in the mid16th century, is of great archaeological interest. The discovery of objects from Europe and China shows that Khami was a major centre for trade over a long period of time.
For more information, please visit http：//whc.unesco.org/en/list/365.
Henderson Island
Henderson Island, which lies in the eastern South Pacific, is one of the few atolls (环礁) in the world whose ecology has not been touched by human beings. It is especially famous for the ten plants and four land birds that can only be seen on the island.
For more information, please visit http：//whc.unesco.org/en/list/487.
The Old City of Jerusalem
As a holy city for three different religions in the Middle East, Jerusalem has always been of great religious importance：It was given a World Heritage Status in 1981 and placed on the “List of World Heritage in Danger”the following year.
For more information, please visit http：//whc.unesco.org/en/list/148.
本文介绍了几个适合观光的世界遗产地的相关信息。
21．What can we know about the Jiuzhaigou Valley?
A．It has different forest ecosystems.
B．It sits at the foot of a 4,800meter high mountain.
C．In all about 140 kinds of birds and animals live there.
D．Most of China's endangered plants can be found there.
答案：A
解析：细节理解题。根据Jiuzhaigou Valley Scenic and Historic Interest Area部分中的“with a series of different forest ecosystems (生态系统)”可知，九寨沟有一系列不同的森林生态系统，故A项正确。
22．The discovery of some of the objects in Khami shows that the city ________.
A．had a very short history
B．was ruined in the mid16th century
C．was once Great Zimbabwe's largest city
D．once played a great role as a trade center
答案：D
解析：细节理解题。根据Khami Ruins National Monument部分中的“The discovery of objects from Europe and China shows that Khami was a major centre for trade over a long period of time.”可知，该发现表明卡米曾经是一个重要的贸易中心，故D项正确。
23．What can be learned about Henderson Island from the passage?
A．It hasn't been greatly influenced by human activities.
B．It isn't suitable for humans to live on.
C．It has been open to visitors for years.
D．It is made up of a few large atolls.
答案：A
解析：细节理解题。根据Henderson Island部分中的“is one of the few atolls (环礁) in the world whose ecology has not been touched by human beings”可知，亨德森岛的生态没有被人类活动所影响，故A项正确。
