While only about 200 astronauts have had the excitement of looking down at Earth and commanding systems on the International Space Station, actually thousands of everyday middleschool students have experienced by Middle School Students, or EarthKAM, a camera system.
EarthKAM is an educational activity and outreach(扩展)investigation that also results in remote Earth sensing and observation. Using the Internet, the students control a special digital camera fixed aboard the space station, enabling them to photograph the Earth's coastlines, mountain ranges and other geographic items of interest from the unique advantage point of space.
While EarthKAM offers a powerful way for students to investigate Earth from the unique perspective of space, it is also inspiring the next generation of flight controllers for space programs—involving university students to control and operate the camera system and related activities from the ground.
In the interview, Brion Au, one of the investigation developers at NASA's Johnson Space Centre, said，“EarthKAM is a payload(有效载荷)by students, for students. They are in charge. This system provides a viewpoint that the astronauts have...it's just aweinspiring！”So far, students have captured more than 40,000 photos of the Earth from the space station as it orbited the Earth once every 90 minutes, traveling at 17,500 miles an hour. The team at EarthKAM posts these photographs online for the public and participating classrooms around the world to view.
Au explains that this education investigation is inspiring students to explore the world by examining Earth, while promoting social studies, art, geography, science, technology, and math, among other important lessons involving research and teamwork. EarthKAM was started by Dr. Sally Ride, originally flying on the shuttles. The camera is located in the window Observational Research Facility, also known as the WORF, one of many the station's research facilities.How have thousands of students experienced similar excitement as astronauts?
| A．In the space station. | B．In the spaceship. |
| C．Using a camera system. | D．Teaming up with astronauts. |
What equipment should the students need for the research?
| A．Computer. | B．Recorder. | C．Telephone. | D．Radios. |
What doesn't belong to the next generation of flight controllers for space programs?
| A．University students' controlling the camera system. |
| B．University students' operating the camera system. |
| C．University students' related activities from the ground. |
| D．University students' investigating Earth from space. |
Who are responsible for EarthKAM?
| A．The astronauts. | B．The students. |
| C．The investigation developers. | D．The teachers. |
What's the main idea of the last paragraph?
| A．DR.Sally Ride explains the details of EarthKAM |
| B．Why the team at EarthKAM posts these photographs online. |
| C．EarthKAM provides a viewpoint that the astronauts have. |
| D．Brion Au explains the details of EarthKAM. |
Every time you go to the supermarket you come away with your purchases packed in plastic bags. But wouldn’t it be kinder to the environment if you asked for paper bags instead?
The answer is not as easy as it might seem. Environmentalists say there are drawbacks to using both plastic bags and paper bags.
80 percent of groceries in the US are packed in plastic bags and the numbers are becoming huge. Consumers use between 500 billion and 1 trillion plastic bags per year worldwide.
Some experts believe that all these bags harm the environment. Plastic takes hundreds of years to break down and, as it does so, poisonous materials are released into the water and soil.
Further damage is caused if plastic bags enter the sea. For example, endangered sea turtles cannot tell the bags from jellyfish, their main source of food, and often choke on them.
However, this kind of bag does have its advantages.
Paper bags use more energy and create more waste than plastic bags. Plastic bags require 40 percent less energy to produce and cause 70 percent less air pollution. They also release as much as 94 percent less waste into the water than paper ones do.
But paper bags do break down more quickly than plastic bags. They don’t endanger wildlife, either.
So what should we do? One possible solution would be to use biodegradable plastic bags. “Biodegradable” means that the bags break down naturally just like a piece of banana peel when it is left outside.
But until biodegradable technology improves, it might be easier to pack things you buy in reusable cloth bags.Compared to paper bags, plastic bags ______.
| A．produce 6 percent more waste |
| B．can be made biodegradable more easily |
| C．can be used as a source of food |
| D．save 40 percent of the energy |
By saying “The answer is not as easy as it might seem,” (in paragraph 2) the writer means _____.
A. biodegradable plastic bags can compete with paper
B. paper bags seem to be kind to environment
C. it’s difficult to say whether plastic or paper bags are better for the environmentWhat does the author suggest people use at the present time?
| A．Paper bags |
| B．Plastic bags |
| C．Biodegradable plastic bags. |
| D．Cloth bags. |
Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic, the inhabitants become annoyed and unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country and how tourism affects them. Tourism should help a country keep the customs and beauty that attract tourists. Tourism should also advance the well-being (health and happiness) of local inhabitants.
Too much tourism can be a problem. If tourism grows too quickly, people must leave other jobs to work in the tourism industry. This means that other parts of the country’s economy can suffer.
On the other hand, if there is not enough tourism, people can lose jobs. Businesses can also lose money. It costs a great deal of money to build large hotels, airports, air terminals, first-class roads, and other support facilities needed by tourist attractions. For example, a major international-class tourism hotel can cost as much as 50 thousand dollars per room to build. If this room is not used most of the time, the owners of the hotel lose money.
Building a hotel is just a beginning. There must be many support facilities as well, including roads to get to the hotel, electricity, sewers（阴沟） to handle waste, arid water. All of these support facilities cost money. If they are not used because there are not enough tourists, jobs and money are lost.Which of the following has most probably been discussed in the paragraph that goes before the passage?
| A．It is extremely important to develop tourism. |
| B．Building roads and hotels is essential. |
| C．Support facilities are highly necessary. |
| D．Planning is of great importance to tourism. |
Too much tourism can cause all these problems EXCEPT ______.
A. a bad impact on other industries
B. A change of tourists’ customs
C. overcrowdedness of places of interestIt is good for local people to be well aware that tourism will _____.
| A．use up a large amount of water |
| B．weaken their economy |
| C．help establish their traditions |
| D．help improve their life |
What I like to advise people is to find out what it is that makes them happy. What do you love to do? If you truly love what you do just go ahead and try to make a living by doing it. People will throw money at you to do it. But you will always have to work hard at it. I have to draw every single day of my life. I have to draw about 20 ideas. My advice is to put aside a certain amount of time every day and make you draw or whatever, especially when you don’t feel like it. Only in this way will you be able to perfect your talent.
The first step you take is to go to your local library and ask for the publications issued in the current years. When you get these publications, try to find the names of the top people concerned and their presidents. After you find these, write down their names and addresses. Keep this list and update it every year. Next thing you want to do is to create at least 40 cartoons. Get a grid（格子） from one of the strips in the newspapers, enlarge it to whatever size you wish and draw inside this grid. Now take the best 20 of your ideas and make them into finished pieces. To do this, you would want to copy them in ink because if you were a professional cartoonist, that was what you should do. Now you can reduce the size of the finished cartoons to fit onto a regular comic’s page. By comparing yours with the others already in print, it gives you a good idea of clarity to your cartoon.
The next step is to write letters to presidents of the publication. In the letters, explain who you think would read your work, or in other words, what group do you think you would target. After you complete these, send all of your information enclosed with letters in the appropriate envelope.
Now as soon as you send out these letters, start to create a brand new strip with all new characters. Don’t get married to one idea because if your idea gets turned down then you will give up. And always remember. If you receive a rejection from any of them, keep in mind that you are working on something better. You will be working on something new and more exciting and the rejection letter will not have any impact. With this in mind…What is the advice from the writer in the first paragraph when you want to succeed in your life?
| A．Stop doing anything until you find something quite suitable for your future career. |
| B．Put aside a certain amount of time every day to consider how to make a living. |
| C．Make a living by something that you truly like to do as your profession and work hard at it. |
| D．Perfect your talent only by drawing some cartoons. |
The purpose of writing a letter to the president was to ____.
| A．get some money to support the later career |
| B．enclose the information on how to become cartoonists with the letter |
| C．focus his attention on the work |
| D．explain who would be the readers of the work |
The underlined phrase “get married to one idea” in the last paragraph probably refers to ______.
| A．having a strong desire to get married |
| B．fixing all attention on one idea |
| C．marrying someone is a good ideas |
| D．refusing one idea to get married |
I suddenly heard an elephant crying as though frightened. Looking down，I immediately recognized that something was wrong，and ran down to the edge of the near bank. There I saw Ma Sha with her three¬ month¬ old calf struggling in the fast rising water，and it was a life and death struggle. Her calf was floating and screaming with fear. Ma Sha was as near to the far bank as she could get，holding her whole body against the rushing water，and keeping the calf pressed against her huge body. Every now and then the rushing water would sweep the calf away.
There was a sudden rise in the water and the calf was washed clean （完全地）over the mother's body and was gone. Ma Sha turned quickly to reach it and pressed the calf with her head and trunk (象鼻) against the rocky bank. Then with a huge effort，she picked it up in her trunk and tried until she was able to place it on a narrow shelf of rock.
Just at this moment，she fell back into the river. If she were carried down，it would be certain death. I knew，as well as she did，that there was one spot (地点) where she could get up the bank，but it was on the other side from where she had put her calf.
While I was wondering what I could do next，I heard the sound of a mother's love. Ma Sha had crossed the river and got up the bank and was making her way back as fast as she could，roaring (吼叫) all the time，but to her calf it was music.
The moment the author got down to the river bank he saw __________.
| A．the calf was about to fall into the river |
| B．Ma Sha was placing the calf on the rock |
| C．the calf was washed away by the rising water |
| D．Ma Sha was holding the calf against the rushing water |
How did the calf feel about the mother elephant's roaring？
| A．It was a great comfort. |
| B．It was a sign of danger. |
| C．It was a call for help. |
| D．It was a musical note. |
What can be the best title for the text？
| A．A Mother's Love |
| B．A Brave Act |
| C．A Deadly River |
| D．A Matter of Life and Death |
It’s never a real problem for us when the weather gets cold. We can put on more clothes, stay next to a fireplace, turn on the air conditioner or simply travel to a warmer city to spend the winter – people have many different ways of dealing with the cold.
But things are not as easy for plants. Unlike humans, plants can’t move to escape the cold or generate heat ( 发热) to keep themselves warm. So how do they manage to survive the freezing winter?
It turns out that plants have their own strategies （策略） too, said a study published on Dec 22 in the journal Nature.
According to researcher Amy Zanne of George Washington University, US, the cold is a big challenge for plants. Their living tissues （活组织） can be damaged when they freeze. “It’s like a plant’s equivalent to frostbite ( 相当于冻疮),” Zanne told Science Daily. Also, the process of freezing and thawing (解冻) can cause air bubbles （气泡） to form in the plant’s water transport system. “If enough of these air bubbles come together as water thaws they can block the flow of water from the roots to the leaves and kill the plant,” she explained.
To live through cold weather, plants have developed three traits （特性） , according to the study. Some plants, such as oak trees（橡树）, avoid freezing damage by dropping their leaves before the winter chill sets in – effectively shutting off the flow of water between roots and leaves – and growing new leaves and water transport cells when the warm spring returns.
Other plants, pine trees（松树） for example, protect themselves by narrowing their water transport cells, which makes it easier for cells to travel among air bubbles.
The third strategy is also the most extreme – some plants die on the ground in winter and start growing as new plants from seeds when conditions get warmer.
However, the study also found that these smart strategies were developed very slowly – over millions
of years of evolution （ 进化）. This leads scientists to worry that plants may not be able to deal with human-caused climate change, which has only started occurring over the past few decades.
Scientists are hoping that this study can help people find possible ways to save plants from the threat
of climate change.
What is the article mainly about?
| A．Why plants are not afraid of the winter chill. |
| B．The ways that plants survive cold weather. |
| C．Changes in plants’ water transport system in winter. |
| D．How plants evolve to keep up with climate change. |
According to the article, if a plant freezes in the winter, ______.
| A．it produces more living tissues to stay alive |
| B．its leaves quickly fall out and its roots begin to die |
| C．lots of air bubbles form in its water transport system |
| D．its water transport system could be blocked in the spring |
What are scientists worried about when it comes to plants according to the article?
| A．Plants may not be able to adapt to the increasingly cold climate. |
| B．Human activities might have a great impact on the pace of plants’ evolution. |
| C．Plants may not be able to evolve fast enough to adapt to human-caused climate change. |
| D．The strategies plants develop are not good enough to protect them against cold. |
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