Have you ever heard of Angel Fall (979 meters)? It is the highest waterfall in the world, deep in the jungle of Venezuela. Few people have ever seen Angel Falls. It is very hard to get there. You can go by land, and you will have to travel for weeks through thick jungles. Also, you can go by plane from Caracas, the capital city on the northern coast, and it would take about four hours.

What will it be like to take a trip by plane from Caracas to the falls? For hundreds of miles you will fly southeast over green plains. Then the land will become higher, and you would see mountains with forests. Soon the land will level out to high plateaus(高原). Finally, you would fly toward a deep canyon with steep, rocky sides.

Suddenly you will see a silver thread (线) in the distance. Then as your plane flies closer, you will see the waterfall more clearly. You will see water falling over a half mile straight down the steep rock. It is a sight you would never forget.

No one knew about this high waterfall until 1930. In that year James Angel, an American pilot, flew over the area. As he was flying over the mountains and canyons, he suddenly saw a waterfall. It was an impressive(印象深刻的) sight: the water seemed to be dropping straight out of the clouds.

In 1941 an American expedition(抢险队) explored and measured（测量）the falls. From the top to the bottom, the water falls more than 3,200 feet. These falls are over 1,000 feet higher than any other falls in the world.

Wild animals in California will soon be a little bit safer. Why? 【小题1】

At about 64 meters long and 50 meters wide, the Wallis Annenberg Wildlife Crossing will go over 10 lanes (车道) of Highway 101 in Los Angeles, the USA. It will be covered in soil and local plants. The government expects the crossing to cost $87 million and be completed in early 2025.

Now, animals hoping to cross the highway are at high risk of being killed. But with the new crossing, animals like Mountain lions, which need a lot of space, can safely travel between the Santa Monica Mountains and the Simi Hills of the Santa Susana mountain range. 【小题2】 And on April 21, 2022, an 18-month-old mountain lion separated (分开) from its mother was hit and killed on another Los Angeles highway. The crossing will help change the situation. Besides, the crossing will also help protect drivers.

【小题3】 They are used in many parts of the world to help animals safely go over or under roads. More than 40 of them can be found in Canada’s Banff National Park. However, this one is different. That’s because it will be not only the first of its kind built near a major city, but the largest in the world.

Just imagine: You could be in rush-hour traffic, and there could be a mountain lion right above you. 【小题4】