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The world’s longest cave system is an enormous network of 420 miles of twists and turns, with limestone (石灰岩) falling from the ceilings in drops.

Mammoth Cave National Park preserves this unique and historical natural wonder. As large as the limestone cave system is, park officials, estimate there may be another 600 miles of cave passageways that have yet to be explored. The incredible rock formations have resulted in the park being recognized as a World Heritage Site, thanks to its extraordinary size and scientific importance –– making it one of only 13 natural US sites with that title.

The caves were created naturally by the process of limestone wearing away. Rain and rivers slowly break down and shape soft limestone, which creates the vast underground network. Not only are they an amazing destination to visit, but the system also provides drinking water for roughly 40% of the US population, and they’re of historical significance too.

The caves act as a time capsule that preserves over 5,000 years of human history — and the caves’ first explorers were Native Americans, who mined the upper levels of Mammoth Cave. Thanks to the cave system’s atmosphere and natural protection from any kind of human disturbance, the archaeological (考古的) sites have been left in great shape.

Mammoth Cave was established as a national park thanks to strong local support. Back in the 1920s, Secretary of the Interior Hubert Work created the Southern Appalachian National Park Commission in 1925 to survey proposed park sites, including the caves. After years of work acquiring the land for the park, as well as building roads, trails (小径), and public facilities, Mammoth Cave National Park was established on July 1, 1941. The park now receives around 2 million visitors a year, with roughly a quarter taking a tour of the caves –– everything from a cultural tour to the more adventurous climbing tours on offer. The cave supports more than 130 wildlife species, such as the eyeless cavefish, which has adapted to the lightless environment by no longer growing eyes, and the cave crayfish.

【小题1】What has made Mammoth Cave National Park a World Heritage Site?
A.The wildlife species.B.The rock formations.
C.The cave passageways.D.The scientific discovery.
【小题2】Why are the caves of historical value?
A.They are an amazing destination to visit.
B.They were first explored by Native Americans.
C.They provide drinking water for the Americans.
D.They preserve human history over 5000 years.
【小题3】What can be inferred from the last paragraph?
A.It took a lot of work to establish the park.
B.Local people donated the land for the park.
C.Around 2 million people visit the caves annually.
D.The site of the park was decided by the secretary.
【小题4】What can be the best title of the passage?
A.Taking cultural and adventurous tours
B.Preserving a unique and historical wonder
C.Exploring the world’s longest cave system
D.Establishing Mammoth Cave National Park
22-23高二下·江苏苏州·期末
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There’s a lot to see in Badlands National Park (BADL).

Castle Trail: A Badlands National Park Favorite.

We’re kicking things off with the longest trail in the park — and it is an excellent one. This 5-mile journey takes you through the backcountry of Badlands, with the main destination being the incredible Castle Rock formation. Along the way, you’ll hike through grassland. And as always in the Badlands, watch out for snakes.

See Bison in Sage Creek Wilderness Area

Are you as crazy about wildlife? Sage Creck is for you. Located in Wall, SD, this is one of the largest areas of preserved mixed-grass prairie (草原) left in the United States. And it’s one of the best places for North American bison (野牛). But remember to always stay in your vehicle, and never get out to approach a bison. This is not only illegal (非法的), but can cost you your life.

Ascend the Amazing Saddle Pass Trail

Saddle Pass is a short trail, but one you won’t want to miss. One of the most photographed spots in Badlands National Park is also one of the coolest climbing experiences, hands down. Here, you’ll climb up the Badlands Wall itself into a view of the White River Valley. The trail gets its name from the shape of the prairie you’ll travel.

Badlands National Park’s Top Hike: Notch Trail

As the most popular hike in the Badlands, Notch Trail features a fantastic ladder climb and absolutely breath-taking views. This trail is worth the difficulty, but it is not recommended for anyone with a fear of heights, and can be dangerous during or after heavy rains. The most Badlands injuries take place here, so be sure to practice safely.

【小题1】What makes Sage Creek special?
A.Its longest trail.B.Its large prairie.
C.Its unique scenery.D.Its dangerous climbing.
【小题2】Which place is named after the shape of a prairie?
A.Castle Trail.B.Sage Creek.
C.Notch Trail.D.Saddle Pass Trail.
【小题3】What are travelers to Notch Trail recommended to do?
A.Practice safely.B.Take a pair of sunglasses.
C.Stay in the car.D.Keep away from the ladder.

The World’s Most Beautiful Places


Bwindi Impenetrable Forest, Uganda

Dense, lush and otherworldly, Bwindi Impenetrable Forest is one of the last habitats of the mountain gorilla. Several hundred call this UNESCO-protected national park home, with the chance for visitors to trek to and meet habituated groups. Its biodiversity extends far beyond its most famous inhabitants, however, almost 350 bird species and around 220 butterfly species can be found within its 331-square-kilometer expanse.


Samburu, Kenya

Thanks to its relative inaccessibility in the heart of Kenya, Samburu is a shelter for some of Africa’s most attractive wildlife. The grassland and acacia(金合欢树)-dotted landscapes of its national reserve are home to the endangered reticulated (网状的) giraffe and Grevy’s zebra, as well as the pioneering Elephant Watch Camp.


Mount Toubkal, Morocco

At 4,167 meters(13,671 feet),Mount Toubkal lays claim to the title of “the roof of North Africa.”The path to its summit zigzags across empty valleys, past holy lands and up steep snowfields before emerging onto a ridge that falls away to give climbers matchless views across the Atlas Mountains.


Zhangjiajie National Forest Park, China

China’s first UNESCO World Heritage Site, Zhangjiajie National Forest Park in Hunan Province is known for its towering sandstone pillars.

Best explored on foot, its back trails make for an easy way to escape the crowds and find the best views. As the mists descend, it’s easy to see why this area has long been an inspiration for traditional Chinese paintings.

【小题1】What do we know about Bwindi Impenetrable Forest?
A.It is the last habitat of the mountain gorilla.B.Almost 350 birds can be found there.
C.There are exactly 220 butterfly species there.D.We can find a diversity of species in it.
【小题2】Why is Sambura home to some of most appealing wildlife according to the passage?
A.It has acacia-dotted landscapes.B.There is a vast grassland there.
C.The weather there is fit for wildlife.D.It is difficult for people to go there.
【小题3】What do Bwindi Impenetrable Forest and Zhangjiajie National Forest Park have in common?
A.They are both under the protection of UNESCO.
B.They are both known for its towering sandstone pillars.
C.They both have diverse species.
D.They both have empty valleys.

Point Reyes

At Point Reyes you will find trails, historic buildings and visitor centers where visitors can enjoy all aspects of the unique area. Visitors can enjoy camping, hiking and biking. Point Reyes National Park also features the Point Reyes Lighthouse and visitor center, and at the visitor center you can learn all about the lighthouse (灯塔) and for the very adventurous tourists a trip down the 308 stairs to the lighthouse is a great option.

Big Sur

Big Sur is a region in California with many wonders to offer visitors. The Los Padres National Forest is an excellent destination for hiking. Throughout the forest there are many trails, including trails allowing visitors to walk along the coastline. In addition, Big Sur is also a fantastic destination for wildlife viewing. This region is one of the few places where the majestic bird can be seen.

Yosemite National Park

Located in central California, Yosemite National Park is an amazing destination for recreational enthusiasts, especially rock climbers. Climbers travel from around the world to take on the challenges presented at Yosemite. There are many other recreational activities to enjoy, including biking, hiking, backpacking and many more. Yosemite Valley has a wide range of attractive sights, and waterfalls.

Joshua Tree National Park

Located in southeastern California, Joshua Tree has some amazing sites to see. There are many nature trails, hiking trails, as well as options for mountain biking and rock climbing. Visitors to Joshua Tree can enjoy the beautiful desert ecosystem. At Joshua Tree you can look into the dense star clouds of the Milky Way, and see clearly. These star clouds are especially dense and bright to the south near the horizon.

【小题1】How do tourists visit the Point Reyes Lighthouse?
A.By bike.B.On foot.C.By air.D.By boat.
【小题2】What can tourists do in Big Sur?
A.Enjoy historic buildings.B.Hunt birds.
C.Walk along the coastline.D.Climb rocks.
【小题3】Where can you go if you'd like to experience the desert ecosystem?
A.Point Reyes.B.Big Sur.
C.Yosemite National Park.D.Joshua Tree National Park.

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