在腾格里沙漠中，探索五湖的秘密
Tengger Desert, also called Tenggeli Desert in Chinese, is located in southwestern Alxa Left Banner, Inner Mongolia Autonomous Region. Sand dunes (沙丘) make up 71 percent of this area, along with several lakes, flatlands, grasslands, and hills. Join us to explore five of the lakes in it.
The plan of a journey:
07:30 Pick you up
08:00 Transport:
Go to Tengger Desert by car. 2h
10:00 Tengger Desert
The vehicle arrives at the entrance of the Tengger Desert and transfers to a desert off-road vehicle (越野车). 1h
11:00 Swan Lake
There visitors can see Malan flowers, wild geese, and swans, and watch and take photos. 1h
12:00 Longyan Emerald Lake
It got its name because of its eye-like shape. 30m
12:30 Ulaan Lake
Ulaan Lake is known as the “Heart of the Earth”. In July and August every year, the lake water is red, just like the heart of the earth. We provide you with free drone aerial photography (无人机航拍). 1h
13:30 Camel Lake
There are many camels eating grass, so it is named Camel Lake. It is suitable for viewing from June to October. 1h
14:30 Guitar Lake
As the name suggests, it looks like a guitar when viewed from a height. It is dark red in color. 30min
15:00 Return and drop you off:
Drop-off by car. 2h
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1.1. What percentage of the Tengger Desert is covered by sand dunes?
A 50%.
B 71%.
C 75%.
D 90%.
解析：选B。细节理解题。根据文章中的“Sand dunes make up 71 percent of this area”可知，沙丘占据了腾格里沙漠71%的面积。故选B。
2.2. Which lake is known as the “Heart of the Earth”?
A Swan Lake.
B Longyan Emerald Lake.
C Ulaan Lake.
D Guitar Lake.
解析：选C。细节理解题。根据文章中的“Ulaan Lake is known as the ‘Heart of the Earth’.”可知，乌兰湖被誉为“地球之心”。故选C。
3.3. How long does the tour last from pick-up to drop-off?
A Four and a half hours.
B Six and a half hours.
C Eight and a half hours.
D Nine and a half hours.
解析：选D。数字计算题。根据旅游计划，从早上7:30接到下午15:00返回并在两小时后（17:00）下车，整个行程包括接送时间在内共需9个半小时。故选D。
4.4. What is the passage?
A An advertisement.
B A story.
C A poem.
D A notice.
解析：选A。主旨大意题。根据文章内容可知，这是一则旅行社的广告，推荐大家去腾格里沙漠进行“五湖穿越”。故选A。