2 . 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.

2. Which of the following can be much easier to enter?

A．Hang Son Doong.	B．Waitomo Caves.
C．Mammoth Cave.	D．Reed Flute Cave.

3. Which country probably has the longest cave system in the world?

A．Vietnam.

B．New Zealand.

C．The USA.

D．China.

3 . It is well known that rhinos (犀牛) have poor eyesight, so they mostly rely on their noses to understand the world around them. But there’s one interaction in which sound plays a key role. Southern white rhino males can either be dominant (支配地位的) or subordinate. And only the dominant males hold and defend territories. New search finds that they can distinguish the calls of other males to know who is who.

“ We found that contact calls carry information about the dominance status of the males. It means that only by listening to the calls, you can say if the male is territorial or subordinate.” Ivana Cinkoval, a zoologist at the University of KwaZulu-Natal in South Africa.

She and her team spent almost two years in South Africa’s Hluhluwe-iMfolozi Park recording the social contact calls of male rhinos. Then they played those calls back to dominant territorial males and watched the responses.

The researchers asked that the rhino calls not be included in this program due to the concern that calls might be used for illegal hunting. Back to the reactions of the rhinos.

“They started to search for the unexpected visitor the most quickly and spent the longest time searching around for the unwelcome visitor after the playback of the subordinate call, which was quite surprising.”

Only territorial male rhinos hold breeding (交配繁育) opportunities with the female rhinos. Subordinate males could thus be interested in challenging the territorial male for dominance. But dominant males rarely lose their territories to subordinate males, at least while they’re in prime condition.

1. What do dominant males rely on to identify others?

A．Sense of hearing.	B．Sense of touch.
C．Sense of sight.	D．Sense of smell.

2. Why didn’t researchers allow recorded calls to be included in the program?

A．To protect their intellectual property rights.

B．To keep people from being frightened by them.

C．To prevent them from being used for hunting rhinos.

D．To cover up the fact of illegal hunting in rhinos.

3. How did dominant males react to the subordinate call?

A．They started to search for a hiding place.

B．They sought for the comer quickly and carefully.

C．They ran away from the unexpected visitors.

D．They looked around with great alarm.

4. What can we infer from the last paragraph?

A．Territorial males’ dominance is generally stable.

B．Dominance males’ position is challenging.

C．Subordinate males are aggressive.

D．Subordinate males have breeding opportunities.

4 . Last weekend, I said goodbye to another dear old friend. We had 12 fine years together, but our relationship was becoming dysfunctional(不正常的). Unwanted emissions and serious health problems were the final straw, leaving me with no choice but to make a trip to the knacker’s(收废汽车者的)yard.

I am now car-free for the first time in 20 years, and it feels strange. When I gave up meat, I did so mainly for environmental reasons, and I didn’t miss it at all. I would like to say the same about my car, but I can’t. It was first and foremost a financial decision: keeping the old car on the road was getting too expensive.

But doing the right thing for the wrong reasons is still doing the right thing — I now have a chance to rethink how I move myself and my family around, and can try to find a more environmentally friendly means of transport.

Going car-free is, I think, a lifestyle change that many of us are going to make over the next few years, as car ownership becomes increasingly unnecessary, expensive and socially unacceptable. However, it is easier said than done. Now my car is gone. I still need to get around. But how? I already cycle to work and use public transport when appropriate. But there are some occasions when a car seems to be the only way.

I won’t buy one: I have joined a car-share program and will use taxis more often. I will hire a car if I need to drive a long distance. But then I am still travelling in fossil-fuelled cars(燃油汽车), like when I quit meat and ended up eating more cheese. I fear I may have swapped one environmental problem for another.

I am also afraid to think about the ultimate fate of my car. I have just offloaded more than a ton of metal, plastic, rubber, fabric, electronics, oil and petrol that will end up in a landfill. There are millions of similar vehicles in the UK alone that will have to go somewhere.

Maybe I am overthinking it. According to Charlie Wilson, a climate scientist at the UK’s Tyndall Centre for Climate Change Research, getting rid of a private car is no doubt a positive step to reduce CO₂ emissions.

He points to research by the OECD’s International Transport Forum. “They showed that moving from a private vehicle fleet(车队)to a shared vehicle fleet can greatly cut the number of vehicles you need to deliver the mobility that we need and want. If that vehicle fleet is electrified, you can also bring CO₂ emissions close to zero.”

So in other words, just get rid of your car.

1. What do we know about the author’s car?

A．It was old.	B．It was green.
C．It was his first car.	D．It was a second-hand car.

2. What do the author’s giving up meat and saying goodbye to his car have in common?

A．He did both for the wrong reasons.	B．He thinks both help him save money.
C．He considers both are right decisions.	D．He did both out of concern for the environment.

3. What does the author fear?

A．He may have to spend more on travel.

B．His lifestyle might be changed completely.

C．He might get bored with public transportation.

D．His decision may fail to help the environment.

4. What does Charlie Wilson say?

A．It is wise to do away with old private cars.

B．It is very easy to deal with old private cars.

C．Electric cars are the solution to traffic problems.

D．The OECD plays a key role in promoting car-sharing.