四、李明介绍了大自然的鬼斧神工——喀斯特地貌。根据首字母提示写出单词，一起来了解一下吧！
Have you ever seen those tall, pointed mountains that look like something from a fairy tale? Or explored huge caves full of strange shapes? These are part of karst landscapes(喀斯特地貌), a natural wonder that China is famous for.
Karst is a special landform formed over millions of years. When rainwater, which is slightly acidic(酸性的), falls on limestone(a type of rock), it s
1 breaks down the rock. This process（过程）c
2 amazing shapes on the surface and underground. In China, you can find some of the most breathtaking karst scenery in the world.
The Stone Forest(Shilin) in Yunnan is a fantastic e
3. It looks like a real forest made of stone! Walking through it, you will be amazed by the countless stones. Local Yi people even have a famous festival there. A
4 world-famous site is the South China Karst in Guilin and Yangshuo. The landscape there has the feature of green-covered karst hill standing along the beautiful Lijiang River. It is so beautiful that it appears on the b
5 of the 20-yuan Chinese banknote. Taking a boat trip along the river is like travelling t
6 a Chinese painting.
B
7 the beautiful surface views, karst areas also hide unbelievable underground worlds, such as the Reed Flute Cave in Guilin. Inside, you can see so many rocks in unusual shapes—some hang down, and others point upwards. All lit up by c
8 lights, red, blue, pink and so on.
These karst landscapes are not just beautiful; they are also v
9 for scientific research. However, they face threats(威胁) from too much p
10 and tourism. Protecting these natural wonders is very important so that future generations can also enjoy their beauty.
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