In the southwest African country of Namibia, and the Sahara lands of Mali further north, the desert elephant does just that.
Although not regarded as a separate species from the African elephant, the desert cousin differs in many ways. Their bodies are smaller, to absorb less heat, and their feet are larger for easier walking across sandy surfaces. They are taller, to reach higher branches. They have shorter tusks (象牙), and most importantly, longer trunks to dig for water in riverbeds.
Desert elephants can travel over 70 kilometers in search for feeding grounds and waterholes, and have a larger group of families. They drink only every 3-4 days, and can store water in a “bag” at the back of their throat, which is only used when badly needed. Desert elephants are careful feeders---they seldom root up trees and break fewer branches, and thus maintain what little food sources are available. Young elephants may even eat the dung (粪便) of the female leader of a group when facing food shortage. During drought they are unlikely to give birth to their young but with good rains the birthrate will increase greatly. Desert elephants have sand baths, sometimes adding their own urine (尿液) to make them muddy!
As we continue to overheat our weak planet, it can only be hoped that other animal species will adapt as extraordinarily well to change as the desert elephant.
1. The underlined part in Paragraph 2 means “_____”.
| A．remains in the African countries |
| B．drinks 120 liters of water a day |
| C．manages to live in desert areas |
| D．eats 150 kilograms of food daily |
| A．rarely ruin trees |
| B．drink only every 3-4 days |
| C．search for food in large groups |
| D．protect food sources for their young |
| A．stories and explanation |
| B．facts and descriptions |
| C．examples and conclusion |
| D．evidence and argument |
| A．Overheating the earth can be stopped. |
| B．Not all animal species are so adaptable. |
| C．The planet will become hotter and hotter. |
| D．Not all animals are as smart as desert elephants. |
2 . Far from the land of Antarctica, a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secret. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish’s blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists’ next research job was clear: Find out what in the fish’s blood kept it from freezing. Their search led to some really strange thing made up of a protein never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein. Or AFGP.
1. What is the text mainly about?| A．The terrible conditions in the Antarctic. |
| B．A special fish living in freezing waters. |
| C．The ice shelf around Antarctica. |
| D．Protection of the Antarctic cod. |
| A．The seawater has a temperature of -1.88℃. |
| B．It loves to live in the ice-salt mixture. |
| C．A special protein keeps it from freezing. |
| D．Its blood has a temperature lower than -2.05℃. |
| A．A type of ice-salt mixture. | B．A newly found protein. |
| C．Fish blood. | D．Sugar molecule. |
| A．sugar | B．ice |
| C．blood | D．molecule |
Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.
Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication.
As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals’ genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics.
Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (矿井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.
The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.
1. Before domestication horses were ______.
| A．caught for sports | B．hunted for food |
| C．made to pull ploughs | D．used to carry people |
| A．it is smaller than the Clydesdale horse | B．horse used to have gentle personalities |
| C．some horses have better shaped than others | D．horses were of less variety before domestication |
| A．carrying heavy loads | B．changing farming methods |
| C．serving as a means of transport | D．advancing agriculture in different areas |
| A．why humans domesticated horses | B．how humans and horses needed each other |
| C．why horses came in different shapes and sizes | D．how human societies and horses influenced each other |
4 . The Crowne Plaza Hotel in Copenhagen is offering a free meal to any guest who is able to produce electricity for the hotel on an exercise bike linked to a generator (发电机). The idea is to get people fit and reduce their carbon footprint. Guests will have to produce at least 10 watt hours of electricity — roughly 15 minutes of cycling for someone of average fitness. Guests staying at Plaza Hotel will be given meal tickets worth $ 36 once they have produced 10 watt hours of electricity. The bicycles will have smart phones attached to the handlebars measuring how much power is being generated for the hotel.
The plan, a world-first, will start on 19 April and run for a year. Only guests staying at the hotel will be able to take part. Frederikke Toemmergaard，hotel spokeswoman, said, “Many of our visitors are business people who enjoy going to the gym. There might be people who will cycle just to get a free meal, but generally I don’t think people will take advantage of our programme.”
Copenhagen has a long-standing cycling tradition and 36 % of locals cycle to work each day, one of the highest percentages in the world, according to the website visitcopenhagen. dk. US environmental website treehugger. com recently voted Copenhagen the world’s best city for cyclists. “Because Copenhagen is strongly connected with cycling, we felt the bicycle would work well as a symbol of the hotel’s green profile (形象).”
If successful，the electric bicycle meal programme will be spread to all Crowne Plaza hotels in the UK, the hotel said in a statement.
1. What is the main purpose of the free meal programme?| A．To promote the hotel’s green concept. |
| B．To make the city known to the world. |
| C．To attract people to the hotel restaurant. |
| D．To get guests to stay longer at the hotel. |
| A．By becoming a professional cyclist. |
| B．By cycling to produce some electricity. |
| C．By linking a smart phone to a bicycle. |
| D．By monitoring his or her carbon footprint. |
| A．The poor local people. |
| B．The environment activists. |
| C．Health-conscious hotel guests. |
| D．Visitors fond of Copenhagen food. |
| A．best chain hotels |
| B．greenest natural environments |
| C．longest bike paths |
| D．highest rates of people cycling to work |
5 . One moment it was quiet and calm in the forest, the next, the air was charged with tension. The elephant had heard the distant alarm calls of animals and her mood suddenly changed. I urged the elephant deeper into the forest. We sounded like a forest fire-crackling, snapping, trailblazing. But through all the noise came a sharp warning cry. The elephant stopped and we heard it again — the tell-tale call of a spotted deer.
I looked quickly around the shadows of the forest. Rays of sunlight shone through tree branches, beneath which the patchwork (交错) of green plants and shadows-within-shadows would make tiger stripes (条纹) look more attractive. Apart from an occasional noise from the elephant’s stomach, the forest was silent.
Gradually, the tension slipped from our bodies. The elephant seized a nearby branch and put it into her mouth. I reached forward and gently moved my hand over the elephant’s neck; there was a soft part, free of wrinkles and hairs, behind her ear.
This was my fourth time to sense the aura of the forest in Corbett, although I saw no tigers in the end. Located at the foot of the Himalayan mountains, Corbett is home to about 135 Bengal tigers, but the forest seemed to be guarding their whereabouts(出没处), a silent reminder of their secrecy and rarity. Still, I was happy enough touching the elephant behind the ear. If I had so desperately wanted to see a tiger, I could have gone to a zoo. After all, spotting tigers merely confirms their beauty; tracking them can make you aware of something more.
1. Which of the following was a clear signal of alarm?| A．The elephant stopped. |
| B．A spotted deer called. |
| C．The elephant seized a branch. |
| D．The forest was silent for a while. |
| A．describing various sounds |
| B．comparing different animals |
| C．listing different activities |
| D．introducing various plants |
| A．To see the diversity. |
| B．To enjoy the scenery. |
| C．To feel the atmosphere. |
| D．To experience the freedom. |
| A．Seeing a Bengal tiger is quite thrilling. |
| B．It is very time-consuming to travel in Corbett. |
| C．It is really worthwhile to study the animals in Corbett. |
| D．The process of finding Bengal tigers is most appealing. |
