The Best Caves in The World
Hang Son Doong, Vietnam
Natural caves don’t come much larger than Hang Son Doong, close to the border between Laos and Vietnam. This cave possesses the largest cross-section of any known cave on the planet, a vast area that is difficult to describe. Supposedly, a Boeing 747 could fly through without damaging its wings, but that doesn’t really do justice to the vastness of Hang Son Doong. The stalactites (钟乳石) here are pretty massive too, with some reaching up to 80 metres.
Waitomo Caves, New Zealand
Glowworms (萤火虫) are there, as far as the eye can see. Okay, not literally, but the Waitomo Cave system on New Zealand’s North Island is best-known for the fluorescent fauna that light up the walls, giving it the not-particularly-creative but completely acceptable “Glowworm Caves” nickname. They are more accessible than other caves on this list, with rafting and adventure tours available to those looking for something a little more thrilling.
Mammoth Cave, the USA
If you have certain expectations from somewhere called “Mammoth Cave”, that is entirely understandable. Mammoth Cave in Kentucky is the world’s longest known cave system, an incredible 420 miles of underground wonder. That’s twice as long as the next longest, by the way, although it isn’t unusual for the USA to go all out on such things.
Reed Flute (芦笛) Cave, China
Named after the reeds that grow outside, which are used to make flutes, obviously, the Reed Flute Cave’s walls are covered with inscriptions from centuries gone by—if evidence was needed that people have been paying attention to this place for a long old time. The inside part of the cave is also lit up by multicoloured lights, giving it a real otherworldly theme that adds weight to the nickname.
1. What is special about Hang Son Doong?| A．It was once a base of a factory. |
| B．It is the deepest cave in the world. |
| C．It has the highest stalactites in the world. |
| D．It owns the largest cross-section in the world. |
| A．Hang Son Doong. | B．Waitomo Caves. |
| C．Mammoth Cave. | D．Reed Flute Cave. |
| A．Vietnam. | B．New Zealand. | C．The USA. | D．China. |
相似题推荐
【推荐1】In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went something like this: A man is stuck up to his waist in a muddy Chicago street. Asked if he needs help, he replies, “No, thanks. I’ve got a good horse under me.”
The city planner decided to build an underground drainage (排水) system, but there simply wasn’t enough difference between the height of the ground level and the water level. The only two options were to lower the Chicago River or raise the city.
An engineer named Ellis Chesbrough convinced the city that it had no choice but to build the pipes above ground and then cover them with dirt. This raised the level of the city’s streets by as much as 12 feet.
This of course created a new problem: dirt practically buried the first floors of every building in Chicago. Building owners were faced with a choice: either change the first floors of their buildings into basements, and the second stories into main floors, or hoist the entire buildings to meet the new street level. Small wood-frame buildings could be lifted fairly easily. But what about large, heavy structures like Tremont Hotel, which was a six-story brick building?
That’s where George Pullman came in. He had developed some house-moving skills successfully. To lift a big structure like the Tremont Hotel, Pullman would place thousands of jackscrews (螺旋千斤顶) beneath the building’s foundation. One man was assigned to operate each section of roughly 10 jackscrews. At Pullman’s signal, each man turned his jackscrew the same amount at the same time, thereby raising the building slowly and evenly. Astonishingly, the Tremont Hotel stayed open during the entire operation, and many of its guests didn’t even notice anything was happening.
Some people like to say that every problem has a solution. But in Chicago’s early history, every engineering solution seemed to create a new problem. Now that Chicago’s waste water was draining efficiently into the Chicago River, the city’s next step was to clean the polluted river.
1. The author mentions the joke to show ________ .| A．horses were fairly useful in Chicago |
| B．the Chicago people were particularly humorous |
| C．Chicago was very dangerous in the spring |
| D．Chicago’s streets were extremely muddy |
| A．lift the level of streets with pipes | B．lower the Chicago River by drains |
| C．build pipes to fight against heavy floods | D．get rid of the street dirt through pipes |
| A．It separated the building from its foundation. |
| B．It interrupted the business of the hotel. |
| C．It involved Pullman turning ten jackscrews. |
| D．It went on smoothly as intended. |
| A．popular life styles and their influences |
| B．environmental disasters and their causes |
| C．engineering problems and their solutions |
| D．successful businessmen and their achievements |
【推荐2】Our open-top tours enable you to fully appreciate vibrant （充满生机的）Brighton and its renowned seafront, its best shopping areas, and the top-class restaurants at Brighton. Discover the city across 15 stops located to get you to visit it all!
Places of interest
Brighton City Sightseeing Tour takes you to visit one of the south-coast's most popular resorts. This city offers many things to do and places to go, from the striking Royal Pavilion, Regency architecture, and Victorian aquariums, to the famous Brighton Pier, Sea Life Centre, and pebble beach.
Tours
Buy your 24h ticket online and hop on and off our comfortable double-deckers as much as you like, to get to know the city at your own pace . You can also buy a Tour Plus ticket which includes all day travel on the local Brighton & Hove buses.
The hop-on and hop-off tours start just west of Brighton Pier. Further information including a lull timetable and map of the route is available at www. city-sightseeing, com.
Accommodation
If you need to stay, Brighton & Hove has a wide variety of options to suit all tastes and budgets. There are guest houses and bed and breakfasts in Brighton & Hove. This is a bustling （热闹的）area of the city with independent restaurants, antique shops and a lively village atmosphere and just a stone's throw from the beach. Pub Entertainment
If you are looking for some entertainment to go with your drinks then there are plenty of options at pubs in Brighton. Mrs. Fitzherbert's regularly has live bands playing and the Ladies' Mile host swing & jazz nights. Above the Grand Central you'll find the Nightingale Room with a regular program of events including theatre and comedy.
1. Where will you choose to visit if you are interested in ocean animal?| A．Royal Pavilion. | B．Brighton Pier. |
| C．Regency architecture. | D．Sea Life Centre. |
| A．It used to be a village. | B．It has many old shops. |
| C．It is very peaceful area. | D．It is not far from the beach. |
| A．Having drinks. | B．Watching comedies. |
| C．Performing with actors. | D．Enjoying a live play. |
【推荐3】It's always adventurous and romantic to visit an island country. Take a look at some breathtakingly beautiful island countries in the world, which everyone should visit at least once in his lifetime
Maldives
It' s believed that Maldives is one of the most popular honeymoon(蜜月) places as well as one of the most beautiful island countries. Situated in the middle of the Indian Ocean, Maldives is made up of a series of ancient coral reefs that grow up along the sides of ancient volcanoes, with fascinating beaches
Fiji
Fiji has plenty of surprises for any adventurous traveler. It is famous for the worlds best surf scenes, attracting many surfing lovers to ride the great waves. Well, if surfing is not for you and you love sitting on the beach and relaxing, hiking or seeing breathtaking waterfalls, Fiji is also a suitable island country to visit
Malta
Malta, a beautiful southern European country in the Mediterranean Sea, has a rich history and culture. There are amazing sky-high cliffs to climb>, wonderful temples to visit and lots of amazing places to go diving. There are plenty of interesting things to explore here and everyone can find something to enjoy. The historic part of Malta is shown in its architecture. great walled cities, and many underground tunnels.
1. Which place will be most likely to be chosen by a newly-married couple according to the text?| A．Maldives | B．the Mediterranean Sea | C．Malta | D．Fiji |
| A．You can see the world's most breathtaking waterfalls |
| B．It is surfing lovers favourite island country |
| C．There are sky-high cliffs to explore. |
| D．You can try the world's longest |
| A．Hike on green plains | B．Ride the greatest waves |
| C．See breathtaking waterfalls | D．Explore underground tunnels |
【推荐1】Find your perfect job today. Start by choosing a sector，location or other options to get the results you want.
Clerk in the West Midlands
The West Midlands Region
$30, 000 per year
Closing date: November 13, 2019
This interesting job is suitable for an individual with high levels of organizational skills, experience of public communications and a keen interest in the West Midlands.
Electricians
Southport, Merseyside
$9, 093 per year
Closing date: October 27, 2019
Primary duties include general repairs, maintenance and store management of electrical workshops. The candidate is required to offer educational certificates and must have good interpersonal skills.
Finance Assistants
The city of Bristol
$ 18.070 to $ 20, 138 per year
Closing date: December 20, 2019
Tasks will involve processing purchase orders. Overall, this post requires a hard-working team player. In return for your hard work, we have a staff benefits package which includes a health cash plan.
Caring and Helpful Workers
Newcastle Emlyn
$5,065 to $ 6,100 per year
Closing date: November 5, 2019
Some jobs don’t require you to have any qualifications or previous experience, but you’ll definitely need a kind, caring nature and a genuine desire to help others.
1. Which job requires educational certificates?| A．Finance Assistants. |
| B．Caring and Helpful Workers. |
| C．Electricians. |
| D．Clerk in the West Midlands. |
| A．Newcastle Emlyn. |
| B．The city of Bristol. |
| C．Southport, Merseyside. |
| D．The West Midlands Region. |
| A．To introduce how to apply for a job. |
| B．To explain the importance of a job. |
| C．To recommend some jobs to people. |
| D．To persuade people to work in the West. |
【推荐2】If you’ve ever dreamed of building a rocket and sending it skyward, dream no more! Maybe just dream a little smaller. Scientific American Custom Media and our partners at Bayer are hosting the BUILD — YOUR — OWN ALKA ROCKET COMPETITION for backyard craft powered by water and effervescent tablets (泡腾片). The winner will become famous overnight and walk away with a $1,000 prize. So pick up some effervescent tablets and get busy building. History awaits you.
Entry: Going for the prize is easy. Build an Alka Rocket. Send it skyward with fuel made only of effervescent tablets and water. And record it all in a video, which you share over social media with the Alka Rocket Challenge. So we can keep track. Please also email the links to your social media posts to alkarocket@sciam. com.
Entry Period: From November 1st, 2020 until December 31st, 2020.
Rocket Requirements: Rockets must be less than one foot in height and six inches in width. They must use only effervescent tablets and water as fuel.For more on how to build a basic Alka Rocket, you can watch the handy video.
Judging Criteria; The judges will award the winner and two runners-up on the basis of creativity of rocket design, the launch and video submission.
Safety (super important!!!): Rockets can be dangerous—even ones powered by effervescent tablets. Any project considered remotely dangerous to humans or the environment will be immediately disqualified.
Notes: Competitors must be American citizens and aged 13 or older. And any competitor under the age of 18 needs to email us a signed parental permission form when he or his team sends us the links to social posts.
If you have questions, submit them to alkarocket@sciarn.com and we’ll do our best to get back to you. Enter and reach for the stars!
1. What is required for the competition?| A．Sharing the rocket launch video over social media. |
| B．Building Alka Rockets less than one meter high. |
| C．Launching Alka Rockets in front of the judges. |
| D．Emailing signed parental permission |
| A．They are heavier. | B．They are riskier. |
| C．They are faster. | D．They are safer. |
| A．A 12-year-old American. | B．An American teenager. |
| C．An English engineer. | D．An English parent. |
【推荐3】Canyoning
The sports of canyoning (蹦谷) explore the high-energy environment where water meets rock on the coast. Protected by wetsuits and helmets, people jump from cliffs and waterfalls and discover caves that would not normally be arrived at.
It was first done in the U.K. by TYF Adventure (01437 721611, www.tyf.com) and several thousand people jump from the cliffs near St David’s each year. A half day canyoning trip costs ￡50 (￡30 for children under 16).
Diving
Diving is not popular with British people. The difficulties of wild waters are greater because the water is colder and not clear enough, but the coasts of Cornwall, Wales and Scotland have some of the best diving in the world.
The British Sub Aqua Club (0870 112 9133, www.bsac.com) and the Professional Association of Diving Instructors (01580 819688, www.padi.com) run courses teaching the important skills.
Surfing
The best surfing places in the UK are on the southwest coast where it is warmer, especially in Cornwall. The best time of year to surf in the UK is late summer and autumn.
The British Surfing Association (01479 861256, www.britsurf.co.uk) has a list of famous surf schools around the country.
Rock climbing
The most popular natural rocks in Britain include the Peak District, the Lake District, while large areas of Scotland are a climber’s ideal place. Climbing courses and climbing walls can be found on the website of the British Mountaineering Council (0870 010 4878, www.thebmc.co.uk).
1. If a couple with their child of 15 join in Canyoning for a day, they will pay ________.| A．￡130 | B．￡160 | C．￡260 | D．￡320 |
| A．Canyoning. | B．Diving. | C．Surfing. | D．Rock climbing. |
| A．Visitors who want to pay a visit to Britain |
| B．Visitors in Britain who are keen on extreme sports |
| C．Chinese students who are interested in British culture |
| D．Travelers who are enthusiastic about camping in China |
