1 . Skeleton is one of the three sliding sports at the Beijing 2022 Olympic Winter Games, alongside the luge(单雪橇)and bobsleigh(大雪橇). With only six medals up for grabs, skeleton has the fewest events at the Winter Games—which means competition will be fierce.
The sport of skeleton has its roots in the most popular winter pastime: sleighing. In the mid-19th century, British and American holidaymakers built the first toboggan(平底雪橇)run in Davos in 1882, and thus the sport of sleighing began.
Two years later, in 1884, the famed Cresta Run—a natural ice skeleton racing toboggan track—was built in St. Moritz, Switzerland(the course has hosted the annual Grand National championships since 1885).
In 1892, a new sledge made entirely of steel was introduced, and some claim that its bony appearance gave the sledge and the sport the name ‘skeleton’.
Men’s skeleton was first introduced on the Olympic program in the 1928 Games in St. Moritz. But due to the sport only being available at the Cresta Run at the time, it fell into obscurity(默默无闻)while the luge and bobsleigh grew in popularity. However, in 2002, the skeleton was reintroduced as a men’s and women’s event at the Salt Lake City Winter Olympics, and has remained a part of the Olympic program ever since.
While Great Britain has the most medals(nine)in skeleton competition at the Olympics, the top spot belongs to the United States(eight medals)by virtue of having four silvers to Great Britain’s one(both nations have three golds, while Britain has five bronze medals, and the United States one).
Great Britain is the only nation to have won a medal every time skeleton has featured at the Olympic Games, and has won at least one medal in each of the five contests of women’s skeleton since its introduction.
1. How many events does skeleton have in the Olympics?| A．Two. | B．Three. | C．Five. | D．Six. |
| A．In 1882. | B．In1885. | C．In1892. | D．In 1928. |
| A．Because its material steel was rare. |
| B．Because there was only one run for it. |
| C．Because only men could take part in it. |
| D．Because it was not on the Olympic program. |
| A．The number of medals. | B．The composition of medals. |
| C．The virtue of the athletes. | D．The times of hosting the Olympics. |
2 . The worldwide 20th century “Green Revolution”, which saw huge year-by-year increases in global grain yields (产量),was fueled by the development in the 1960s of new high-yielding dwarfed (矮小) varieties known as Green Revolution Varieties (GRVs).
These dwarfed GRVs are common all over the world in today’s wheat and rice crops. Because they are dwarfed, with short stems, GRVs devote relatively more resources than tall plants to the growth of grains rather than stems, and are less likely to suffer yield losses from wind and rain damage. However, the growth of GRVs requires farmers to use large amounts of nitrogen fertilizers (氮肥) in their fields. These fertilizers are costly to farmers and cause extensive damage to the natural environment. The development of new GRVs combining high yields with reduced fertilizer requirements is thus a global agricultural goal.
Researchers at the University of Oxford and the Chinese Academy of Science have discovered for the first time a gene that can help reach the goal. Comparing 36 different dwarfed rice varieties, the researchers identified a novel natural gene that helps increase the rate at which plants make use of nitrogen from the soil. This gene, called GRF4, can increase the amount of a protein (蛋白质) in plant cells. GRF4 is actually a promoter that encourages the activity of other genes—genes that promote nitrogen uptake (摄入). Professor Harberd said, “Increasing GRF4 levels could contribute to an increase in the grain yields of GRVs, especially at low fertilizer input levels.”
The researchers say the latest rice variety containing GRVs should now become a major target for farmers in increasing crop yields and fertilizer use efficiency, with the aim of achieving the global grain yield increases necessary to feed a growing world population at a reduced environmental cost. It is very urgent at the moment.
Professor Harberd added, “This study is an example of how studying fundamental science objectives can lead rapidly to potential solutions to global challenges. It shows how the discovery can enable chances for food security and future new green revolutions.”
1. What can we know about dwarfed GRVs?| A．They have higher yield and taller stems. |
| B．They are a “double-edged sword”. |
| C．They are environmentally friendly. |
| D．They can be easily affected by weather. |
| A．Increasing the rate of nitrogen use. |
| B．Producing cheaper nitrogen fertilizers. |
| C．Using fewer fertilizers to produce more grains. |
| D．Finding a gene to solve agricultural problems. |
| A．It promotes other genes' activity. |
| B．It increases the output of crops. |
| C．It takes in nitrogen from the soil. |
| D．It lowers fertilizer input levels. |
| A．Decreasing the amount of fertilizers required by GRVs. |
| B．Encouraging farmers to adopt the new rice variety. |
| C．Calling on farmers to use effective fertilizers. |
| D．Focusing on the improvement of GRF4. |
| A．GRVs—a potential measure to achieve global food security. |
| B．The influence of agricultural development on the environment. |
| C．The importance of raising public awareness of global issues. |
| D．GRF4—foundation for new green revolutions. |
3 . Think of the last time you disagreed with another person. Maybe you argued with a sibling (兄弟；姊妹) over what to watch on TV.
How can you understand both sides of an issue? Often,it’s best to start by asking questions. Questions help us learn about the world around us.
When seeking to understand both sides of an issue, it’s important to know the difference between facts and opinions. Remember, facts are based on true information. Opinions can change from person to person. Paying attention to facts can stop biases (偏见) from taking over in a disagreement.
Maybe you’re wondering why it’s important to understand both sides of an issue, anyway. After all, don’t most people just want to prove that their side is right? Often, that’s true. However, understanding the whole issue can lead to both sides working together.
| A．Let’s agree to disagree. |
| B．Disagreements may be uncomfortable at first. |
| C．In many situations, disagreements are unavoidable. |
| D．The ability to ask the right questions reflects good thinking ability. |
| E．Or perhaps you tried to convince grown-ups that ice cream makes a better dinner than vegetables. |
| F．The right questions can also help us learn about other people. |
| G．This can help everyone involved see both sides of the issue. |
4 . Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answer to these questions is yes. To some extent our intelligence is given to us at birth, and no amount of education can make a genius out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of person's intelligence are fixed at birth, whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be supported in a number of ways.
It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random from population, it is likely that their degree of intelligence will be completely different. If, on the other hand, we take two identical twins, they will very likely be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all are likely to have similar degree of intelligence.
1. Which of these sentences best describes the writer’s point in Paragraph 1?| A．To some extent, intelligence is given at birth. |
| B．Intelligence is developed by the environment. |
| C．Intelligence is fixed at birth, but is developed by the environment. |
| D．Some people are born clever and others born stupid. |
| A．purposely | B．frequently |
| C．independently | D．aimlessly |
| A．On Intelligence |
| B．What Dose Intelligence Mean ? |
| C．We Are Born with Intelligence |
| D．Environment Plays a Part in Developing Intelligence |
5 . Scientist， conservation organizations and government trying to stop the trend of extinction （灭绝） often focus on protected areas such as national parks and wildlife preserves. But with as many as million species（物种） at risk， this plan of action may not be enough to conserve wildlife.
Slowing the mass extinction that now appears to be underway will require more creative means of coexisting alongside wild plants and animals. A new study indicates the effectiveness of some such approaches by examining some lands managed by indigenous groups.
“ We show really strongly that， from a biodiversity standpoint in terms of species richness，indigenous － managed lands are at least comparable to protected areas， ” says biologist Richard Schuster of Carleton University. And in some places， they are better than parks and preserves －even though indigenous communities may use their lands’ resources by hunting or searching for food.
Schuster and his team analyzed more than 15，000 areas in Australia， Brazil and Canada. They found that the total diversity of wildlife was highest on lands either managed or co － managed by indigenous groups， while randomly selected areas with no formal protection were the least bio－diverse. For threatened species in particular， indigenous lands scored slightly higher than protected lands on overall species richness in Brazil and Canada， as well as higher for threatened animals in Australia.
Each country has a different geography， climate and history. Yet remarkably， Schuster says， the best indicator for species diversity is whether a given area was managed by an indigenous community. He pointed out that practices such as sustainable（可持续的） hunting， fishing and searching， as well as burning， are more likely to occur in such areas. Don Hankins， an ecologist at California State University，agrees. “ there’ s probably going to be more of a connection to the land， ” he says， “ and a use of the land for the things that are there， compared to a national park. ”
“ It’ s really important to listen to the people who live on the land and have them drive the stewardship efforts going forward， ” Schuster says， adding that partnering with indigenous communities may enable the world’ s countries to better meet a wide range of conservation goals： “ We really need all the help we can get as a global community to prevent species extinction that we’ re facing right now. ”
1. What does the underlined word “ indigenous” probably mean in Paragraph 2？| A．Social. | B．Native. |
| C．Protected. | D．Threatened. |
| A．National parks are even higher in species diversity. |
| B．Indigenous communities overhunted on their lands. |
| C．Some preserves almost have no formal protection. |
| D．Indigenous lands do better in keeping bio－diversity. |
| A．Species diversity depends on geographical positions. |
| B．Humans’ everyday activities are no longer sustainable. |
| C．Indigenous groups have a close bond with their lands. |
| D．Protected areas work perfectly in wildlife protection. |
| A．Beating back extinction. | B．Dealing with environmental problems. |
| C．Setting up nature reserves. | D．Fighting against unsustainable behaviors. |
