1 . The Hope Diamond is one of the world’s most famous jewels. It was in the possession of a series of people: kings, bankers, rich women and thieves, before its arrival 60 years ago at the Smithsonian Institution in Washington, D.C.
As a rare blue diamond, it has a complex social history, to be sure. But, far more so is its geological history, researchers say in a new report. This is the first time anyone has come up with a fact-based study or model for how blue diamonds form.
The group looked at 42 blue diamonds, including one from South Africa that recently sold for $25 million in 2016. Researchers could tell where the stones were formed based on the very small minerals trapped inside.
Diamonds are a hard, clear form of pure carbon called a crystal (结晶). They form under extreme heat and pressure. Blue diamonds crystallize alongside water-bearing minerals that long ago were part of the floor of the sea. But these minerals were pushed deeper underground during the movement of the Earth’s plates.
Scientists already knew these diamonds received their blue color from the element boron (硼). The study says that boron had once been in ocean water but was eventually pushed into the seafloor rock. Over millions of years, the boron continued to move deep underground.
Many diamonds appear colorless. Often, however, they have some yellow color. Still others have a light brown, pink or green color. About 99 percent of all diamonds form somewhere between 150 to 200 kilometers underground, a far shallower birthplace than their blue relations. “These diamonds are among the deepest ever found,” Carnegie Institution for Science geochemist Steven Shirey said of the blue diamonds.
The public can see the Hope Diamond at the Smithsonian National Museum of Natural History in Washington D.C.
1. By saying the underlined part in Paragraph 2, the researchers mean the blue diamond ________.| A．was formed in extreme weather |
| B．has a very complex forming history |
| C．has a far-reaching influence in society |
| D．used to be very popular among rich people |
| A．By observing their colors. |
| B．By studying their structures. |
| C．By referring to where they were found. |
| D．By examining tiny substances in them. |
| A．The water. | B．Extreme heat and pressure. |
| C．A special matter. | D．The seafloor rock. |
| A．They contain several colors. |
| B．They form in much deeper underground. |
| C．They come into being in a different way. |
| D．They are found near the earth’s surface. |
| A．The social status of the Hope Diamond. |
| B．The discovery of the Hope Diamond. |
| C．The formation of the blue diamond. |
| D．The diversity of diamonds. |
2 . Mars on Earth
Devon Island has always been a cold and uninhabited(无人居住的) place in the Canadian Arctic. Day after day there are high winds and the temperature is below freezing. But for the first time, despite the terrible weather conditions, Devon Island is the new home for a group of explorers from NASA. They are living here for a few months in order to train and learn how to live and work on Mars. The group’s members come from various backgrounds and nationalities, but they all have the same purpose: to find out how people can live on Mars in the future.
They have chosen Devon Island because the environment and landscape is similar in many ways to Mars. The surface is freezing cold and the ground is rough. However, there are some differences on Mars, where the atmosphere is poisonous to breathe. Devon Island is easier to travel to and it has its own dangers that you won’t find on Mars. For example, you might meet a hungry polar bear on Devon Island!
One thing the team wants to develop is suitable clothing for Mars. This includes a space suit. The suit they are testing at the moment is strong enough but it’s too difficult to put on and take off. It’s very big and bulky, which means that just walking around is very difficult and tiring. In addition, people will need to do experiments on Mars while wearing the suit so they have to be able to move around easily. One team member, Andy Overbeeke, specializes in space suit engineering. He explains, “You have to think about what they’re really going to operate in.”
Another part of daily life on Mars will be meals and food. Creating a new home on Mars requires a lot of food. So the big question is: can you grow plants in order to survive? Scientists believe that growing plants on Mars might be possible. Mars and Earth have many similarities. They both have about the same amount of dry land and a 24-hour day. However, the atmosphere on Mars is totally different, so Canadian scientist Alain Berinstain is attempting to grow plants in a special greenhouse that you could also build on Mars. The greenhouse needs to run 365 days a year, so it uses a combination of solar energy and wind power.
People living on Mars will also want their own transportation. For this, the team on Devon Island have built the “Martian Rover”. It’s a huge heavy vehicle that can travel over rocks and rough terrain. This kind of testing takes many days but so far the work has been valuable and effective. As a result, the whole team now believes their work is crucial and that it’s possible for humans to land on the planet Mars and create a home there. Addy Overbeeke adds: “We know that it’s man’s destiny to go out and do space exploration. It’s always time to think about what you want to do in the future.”
1. The explorers are living on Devon Island to ________.| A．receive a training in astronomy |
| B．set up an advanced research lab |
| C．learn how to live and work on Mars |
| D．make a living in an uninhabited land |
| A．create a new home |
| B．improve the atmosphere |
| C．build special greenhouses |
| D．reduce the area of dry land |
| A．man may live on Mars in the future |
| B．Martian Rover has failed to stand the test |
| C．Mars and Devon Island have the same soil condition |
| D．scientists have mastered the method to grow plants on Mars |
3 . America's Most Beautiful Places to Visit in Spring
Washington, D.C.
Every spring, Washington, D.C.is blanketed in pink with cherry blossoms. To celebrate the event, come to the National Cherry Blossom Festival, which takes place from the last week in March to the second week in April. You can view the flowers or take part in festival events.
Charleston, South Carolina
No list of beautiful spring cities would be complete without mention of Charleston, South Carolina. Delight in hanging plants, cobblestone streets, and historical castles. And because of year-round pleasant temperatures, you might even hit a beach day in March or April.
North Cascades National Park, Washington
The North Cascades is home to everything from mountains to forests to grassland, and the scenery changes seasonally. In spring—the snow disappears to bring strong waterfalls, and wildflowers spot the land. Different areas will present totally unique plants, so give yourself a few days to take in the sights.
Central Park, New York
New York is the city that never sleeps, no matter what the season, but springtime is the best time to take a walk through Central Park. It is one of the most filmed locations in the world. A spring time promises walks past Victorian houses, a brief visit to ancient shops, and of course long walks by the lake.
1. Which is the best time to visit Washington, D.C.?| A．March 15. | B．April 1. |
| C．March 8. | D．April 28. |
| A．cherry blossoms and various celebrations |
| B．pleasant weather and historical castles |
| C．strong waterfalls and wild flowers |
| D．Victorian houses, old shops, and long walks |
| A．Central Park, New York | B．North Cascades National Park |
| C．Charleston | D．Washington, D.C. |
4 . Famous Modern Chinese Buildings
Beijing International Airport
The first place most visitors see when they arrive in China is Beijing International Airport. The airport was constructed in the 1950s. It has an indoor garden, a children’s playground, and over 70 food businesses in Terminal 3 alone.
Shanghai World Financial Center
Completed in 2008, SWFC took over 10 years to complete due to financial shortages and construction delays. Since its completion, it has won countless architectural awards.
Tourists are welcome at SWFC's viewing platform, which at 474 meters above ground is the worlds highest closed viewing platform.
The Water Cube
It was constructed for use during the Beijing 2008 Summer Olympics. Now visitors can express surprise at the architecture of the building. They can enjoy the indoor atmosphere as well.
Among the offerings of the Water Cube are a restaurant and bar, a shopping area, and Water World, a family water park
The Bird's Nest, Beijing
It was designed mainly for the 2008 Summer Olympics. It can hold up to 80,000 people and has been used for a winter theme park. Nowadays, its main income is as a tourist attraction. It draws more than 20,000 tourists every day.
National Center for the Performing Arts
It was completed in 2007. The building is surrounded by a man-made lake, requiring guests to enter via an underground hallway. It is home to an Opera Hall, Music Hall, and Theater.
1. Which of the following buildings was first constructed?| A．Beijing International Airport. | B．Shanghai World Financial Center. |
| C．The Water Cube. | D．The Birds Nest, Beijing. |
| A．It needed more construction workers. | B．It was short of money. |
| C．It added an extra viewing-platform. | D．It faced too much terrible weather. |
| A．By renting the winter theme park. | B．By increasing its opening time. |
| C．By charging tourists for admission fees. | D．By giving some live concerts. |
| A．Enjoy sports events. | B．Play musical instruments. |
| C．Attend science lectures. | D．Watch different performances. |
Long ago the Panamint Indians called this place "Tomesha"-- the land of fire. Death Valley's present name dates back to 1849, when a group of miners coming across from Nevada became lost in its unpleasantness and hugeness and their adventure turned out to be a sad story. Today Death Valley has been declared a National Monument and is crossed by several well-marked roads where good services can be found easily. Luckily the change created by human settlement has hardly ruined the special beauty of this place.
Here nature created a lot of surprising, almost like the sights on the moon, ever-changing as the frequent wind moves the sand about, showing the most unusual colors. One of the most astonishing and colorful parts of Death Valley is the Devil's Golf Course, where it seems hard for one to tell reality from dreams. Sand sculptures stand on a frightening ground, as evening shadows move and lengthen.
1. The name of the valley comes from__________ .
| A．an Indian name | B．the death of the miners |
| C．the local people | D．a National Movement |
| A．no one had ever known the desert before the miners |
| B．it's still not easy to travel across the desert |
| C．people can find gas-stations, cafes and hotels in the desert |
| D．people have changed the natural sight of the desert |
| A．the terrible sights | B．the moon-like sights |
| C．dream-like sights | D．the ever-changing sights |
| A．appreciates | B．is fearful of | C．dislikes | D．is tired of |
