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　　As we know, it is not easy to build a satellite．Building a traditional satellite normally takes years．The costs can be as high as $ 250 million or more．Most members of the design teams have worked in the field for a long time．They hold advanced degrees in math, science, or engineering．

　　But things are changing．High costs, unusual educational requirements and long start-up times are no longer an obstacle to space exploration．The scientists at Stanford University have developed a new type of tiny, inexpensive earth-orbiting satellites that go from ideas to launch(发射)in a year．

　　So far, college students have built and launched several cube-shaped satellites, or Cubesats．At least 15 more are ready to go．Those already in orbit(轨道)take pictures, collect information and send it back to the earth, just as regular satellites do．

　　But you might not even have to wait until you get to college to start designing and building your own satellite．A new program called KatySat aims to get teenagers to take part．Once kids understand what satellites can do, says Ben Yuan, an engineer at Lockheed Martin in Menlo Park, Calif, the kinds of applications they’ll come up with may be countless．

　　“We’d like to put this technology(技术)in your hands,” he tells kids．“We’re going to teach you how to operate a satellite．Then we want to turn it over to you as a sandbox for you to play in．We want you to take the technology into new directions that we haven’t thought of yet．”

　　Education isn’t the only goal of CubeSats．Because these tiny, technology-filled boxes are relatively inexpensive to build and can be put together quickly, they’re perfect for testing new technologies that might one day be used on major space tasks．

　　The biggest challenge now is to find ways to bring the satellites back to the earth after a year or two．Otherwise, major highways of space junk could gradually increase as CubeSats become more common．

　　Nowdays challenge and high school students are getting a chance to learn what it takes to explore in space．Someday－perhaps a lot sooner than you imagine－you might get to design, build and launch your own satellite．If you do, you’re sure to have fun．And you might also get crazy about science for life．

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阅读下面短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

　　YOU may feel curious about students in other countries：Do they also have so much homework? What do they do in their spare time?

　　On April 8, a report came out on the lives of high school students in China, Japan, South Korea and the US．It surveyed around 6, 200 students from the four countries last year．You will find the answers to many of your questions in this report．

　　Who studies hardest?

　　Chinese students spend the most time studying．Nearly half of Chinese students spend more than two hours on their homework every day．That's much more than students of the US(26.4％), Japan(8.2％)and South Korea(5.2％)．

　　Who sleeps most often in class?

　　Japanese students fall asleep in class most often．About 45％ of them said they sometimes doze off in class．In South Korea, it's 32％; in the US, 21％; and 5％ in China．

　　South Korean students don't like taking notes．About 70％ said they write down what the teacher says in class, many fewer than in Japan(93％), China(90％)and the US(89％)．

　　Who is the most distracted(分心的)?

　　American students are the most active in class, but also the most distracted：64.2％ said they chat with friends in class; 46.9％ said they eat snacks in class; and 38.9％ said they send e-mails or read unrelated(无关的)books in class．

　　What do they do after school?

　　In their spare time, most Chinese students study or surf the Internet．Most American students hang out with their friends．Most Japanese students do physical exercises．Most Korean students watch TV．

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