Home to the headwaters of the Yangtze, Yellow, and Lancang rivers, the Sanjiangyuan area on the Qinghai-Tibet Plateau (青藏高原)
Decades ago, serious
Today, as people walk on the vast land of Sanjiangyuan,
Bali is a beautiful island of Indonesia. Nowadays, it is becoming a destination that is popular
There is a rainy season that is perfect for
Bali also has many
3 . The State of California is depending on its forests to help cut down planet-warming CO2. But that climate-change strategy may be risky, as new research from the University of California, Irvine(UCI)reports that trees in California’s mountains and open spaces are dying from wildfires and other pressures — and fewer new trees are filling the blank.
“The forests are not keeping up with these large fires,” said study co-author James Randerson, the Ralph J. and Carol M. Cicerone Professor of Earth system science at UCI. Acrossthe whole state, tree cover area has dropped 6.7% since 1985. “These are big changes in lessthan forty years,” he said. It’s the first time that researchers have been able to measure tree population fall in California, and find out the reasons(wildfires and woodcutting).
For the study, the UCI-led team used satellite data from the USGS and NASA’s Landsat mission to study plant changes between 1985 and 2021. They found that one of the most obvious falls in tree cover was in southern California, where 14% of the tree population in local mountain had disappeared, maybe everlastingly.
“The ability. of forests to recover(恢复)from fire appears to be dwindling in the south,” said Jonathan Wang, a researcher in Randerson’s research group, who led the study coming out in AGU Advances. “At the same time, the state’s coverage of bushes and grasses is rising, which could mean more everlasting ecosystem shifts(生态系统转化).”
“The speed and scale of fall in tree cover is different across the state. Tree cover in the Sierra Nevada, for example, stayed relatively unchanged until around 2010, then began dropping suddenly. Fortunately, in the north, there’s plenty of recovery after fire,” said Wang, perhaps because of the area’s higher rainfall and cooler temperatures. “This threat(威胁) to California’s climate solutions isn’t going away anytime soon,” Wang said. “We might be entering a new age of bigger fire and vulnerable(易受损的) forests.”
1. What mainly helped California cut down CO2?| A．Rich forests. | B．Less vehicles. |
| C．Energy saving. | D．Fine weather. |
| A．Poor soil. |
| B．Continual floods. |
| C．High demand for farmland and food. |
| D．Large wildfires and people’s cutting trees. |
| A．Suitable. | B．Falling. | C．Obvious. | D．Boring. |
| A．California’s trees will die out in the future |
| B．California’s environment will face a big challenge |
| C．The reasonfor California wildfires has been found out |
| D．Wildfires seriously threaten California’s tree cover |
Antarctica,the fifth largest continent in the world,
After a Norwegian called Carstens Borchgrevink became the first man
Autumn Equinox (秋分) lies at the midpoint of autumn,
By Autumn Equinox, most of the areas in China
According to experts, on the Spring Equinox and Autumn Equinox, the day and night are of equal time both in the southern and northern hemispheres. Standing eggs on end,
But once it
6 . The New Caledonia Barrier Reef (新喀里多尼亚堡礁)is located in New Caledonia in the South Pacific，and is the second－longest coral reef in the world，after Australia's Great Barrier Reef. The New Caledonia Barrier reef surrounds Grand Terre，New Caledonia's largest island，as well as the Ile des Pins and several smaller islands,reaching a length of 1，500 km. The reef encloses(围住) in a lake of 24，000 square kilometers，which has an average depth of 25 meters. The reefs lie up to 30 kilometers from the shore，but extend almost 200 km to the Entrecasteaux reefs in the northwest. This northwestern extension encloses the Belep Islands. Several natural passages open out to the ocean. The Boulari passage(通道)，which leads to Noumea，the capital and chief port of New Caledonia，is noted for the Amedee lighthouse.
The reef has great species diversity with a high level of endemism(动植物的特有分布)，and is home to endangered dugongs，a kind of sea animal，and is an important nesting site for Green Sea Turtle.
Most of the reefs are generally thought to be in good health. Some of the eastern reefs have been damaged by wastewater from nickel mining(镍开采)on Grand Terre. The waste from mining，agriculture，and grazing(放牧) has affected reefs near river mouths，which has been worsened by the destruction of mangrove forests，which help to keep wastes. Some reefs have been buried under several meters of wastes.
In January 2002，the French government proposed(提议) listing New Caledonia's reefs as a UNESCO World Heritage Site. UNESCO listed New Caledonia Barrier Reef on the World Heritage List on 7 July 2008.
1. Some of the New Caledonia's reefs have been damaged mainly because of ________.| A．human's activities |
| B．natural disasters |
| C．the earth's movement |
| D．its own development |
| A．New Caledonia only has an island named Grand Terre. |
| B．The New Caledonia Barrier reef is 25 meters under the sea surface. |
| C．Noumea is the capital and chief port of Grand Terre. |
| D．Australia's Great Barrier Reef is the largest coral reef in the world. |
| A．it is special in species diversity |
| B．it will disappear in the near future |
| C．it is covered with thick forest |
| D．it is rich in nickel |
| A．dugongs are well protected in the New Caledonia Barrier Reef |
| B．the Boulari passage is famous for the Amedee lighthouse |
| C．Green Sea Turtle is in danger because of the pollution |
| D．human beings take no measures to protect the New Caledonia Barrier Reef |
7 . Ottawa is the capital of Canada. It is the second largest city in Ontario and the fourth largest city in the country.
The Centre Block is the main building on Parliament Hill (国会山). There also stand several ceremonial spaces, such as the Hall of Honor and the Memorial Chamber. The present Centre Block is the second copy of the building, after the first was undermined by a big fire in 1916, and it is one of the most recognizable buildings in Canada.
Downtown Ottawa is the commercial and economic centre of the city. Most of the buildings are office towers. While most of Ottawa’s high tech industry is based elsewhere, it has an important presence in the downtown center. The downtown also contains a number of apartments, hotels, and the older single family homes and townhouses along its edges (边缘).
The National Gallery of Canada is one of Canada’s earliest art galleries. The Gallery has a large and varied collection of paintings, drawings, sculpture and photographs. Although its focus is on Canadian art, it also holds works by some well-known American and European artists.
The Rideau Canal is the oldest continuously operated canal (运河) system in North America. At the very beginning, it was used to provide a safe supply and communication route between Montreal and the British naval (海军的) base in Kingston. It remains in use today mainly for people to boat and enjoy themselves, with most of its original structures undamaged. The locks on the system open for navigation (航海) in mid-May and close in mid-October.
1. What does the underlined word “undermined” in Paragraph 2 mean?| A．Destroyed. | B．Overcome. | C．Completed. | D．Checked. |
| A．Paintings from Europe. | B．Sculpture and photographs. |
| C．Drawings by American artists. | D．Artworks by Canadian artists. |
| A．public transportation | B．pleasure boating |
| C．safe supply | D．communication route |
| A．Reasons for Visiting Ottawa | B．The Long History of Ottawa |
| C．Some Famous Places in Ottawa | D．An Unforgettable Trip to Ottawa |
The falls are named after Queen Victoria by Livingstone. They were known to the native people in the 18th century as: "the smoke that thunders". The waterfall is formed as the two-kilometer-wide Zambezi River spills (溅) over the edge of its giant stone riverbed and falls into the gorge (山谷) below. At their highest point, the Victoria Falls drop a distance of 108m, almost twice as far as the Niagara Falls. As much as 546 million cubic meters of water per minute falls over the edge from that height.
Viewing the falls from the Zambian side means that visitors can follow a path that goes right up to the falls. The falls can also be viewed from the Boiling Pot, right in the depths of the gorge at the bottom of the falls. The 111-meter-high Victoria Falls Bridge, a railway crossing, is now a popular place for Bungee jumping. It can be crossed on foot for excellent views of the falls and the winding blue-green waters of the Zambezi River. It is also possible to see the falls from a plane.
The area around the falls is a major game-viewing place. The best time to view the Victoria Falls is between December and July, when the water level is the highest. Contact Addresses Tourist Centre, Livingstone, Zambia Tel: (03) 321 404E-mail: zntb@zamnet.zm Website: www.zambiatourism.com。
1. The author of the passage is likely to be ______.
| A．a government officer | B．a tourist guide |
| C．a traveler | D．a teacher |
| A．are the best place to enjoy Bungee jumping |
| B．drop twice as far as the Niagara Falls |
| C．are a man-made wonder in Africa |
| D．were discovered by a British man |
| A．2. | B．3. | C．4. | D．5. |
| A．introduce a famous natural wonder —the Victoria Falls |
| B．tell us the discovery of the Victoria Falls |
| C．show how the Victoria Falls are formed |
| D．advise travelers to come to the Victoria Falls |
9 . Dubai boasts (夸口) that it has just built a “new global landmark”—the Dubai Tower, which stands 512.1 meters high now and has just become the tallest building in the world.
The Dubai Tower now surpasses Taiwan’s Taipei 101, which is 508 meters tall, and has 141 storeys, more than any other building in the world.
The Dubai Tower, being built by South Korea’s Samsung Corporation and scheduled for completion next year, is one of a series of great projects taking shape in Dubai. The final projected height of the tower has remained a secret since the project was launched in January 2004; however, it is rumored that the tower will be more than 700 meters tall and have more than 160 storeys.
The Dubai Tower has become the tallest building in the world in just 1,276 days, leaving behind other tall buildings.
The Dubai Tower will house 30,000 apartments in addition to the world’s largest shopping mall. It is the centerpiece (重要工程) of the 20-billion-dollar venture. Another venture gradually emerging across the desert sands is Dubailand, a series of multi-billion-dollar projects claimed to be the Middle East’s very own Orlando. Dubai also paid 100 million dollars to buy the Queen Elizabeth II, one of the world’s superb cruise liners (游轮), which it plans to turn into a luxury floating hotel.
Faced with decreasing oil wealth, the Western-oriented emirate (酋长国) has raced to turn itself into a business and leisure hub and it aims to more than double the number of tourists to 15 million by 2015.
1. The underlined word “surpasses” in the second paragraph means____.| A．is equal to | B．matches |
| C．is left behind by | D．is higher than |
| A．Dubai land | B．Orlando |
| C．Taiwan’s Taipei 101 | D．The Twin Towers |
| A．Because it wants to attract more tourists to its places of interest. |
| B．Because it produces less oil than ever. |
| C．Because it aims to race with other countries to show its wealth. |
| D．Because it wants to set a new world record. |
| A．The Dubai Tower is 508 meters tall and has more than 141 storeys. |
| B．The final height of the Dubai Tower is over 700 meters tall. |
| C．Samsung Corporation has completed building the Dubai Tower. |
| D．The Dubai Tower has apartments and a shopping mall. |
What defines a healthy city Is it a place with a lot of open spaces
Copenhageners love to walk. Foot traffic accounts
