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    阅读理解。
         Astronauts aboard the space station celebrated a space first on Wednesday by drinking water that had
    been recycled from their urine (尿), sweat and water got from air. They said "cheers" to NASA workers
    on the ground.
         The urine recycling system is needed for astronaut stations on the moon and Mars. It also will save
    NASA money because it won't have to ship up as much water to the station by space shuttle or cargo rocket.
    Besides, it's important as the space station is about to expand (扩大) from three people living on board to
    six.
         The recycling system had been brought up to the space station last November, but it couldn't be used
    until samples (样品) were tested back on earth. So when it came time to actually drink up, NASA made a
    big deal of it. The three-man crew stood holding their drinks and congratulated engineers in two NASA
    centers that worked on the system.
         "This is something that had been the stuff of science fiction," American astronaut Michael Barratt said
    before taking a small mouthful. The taste is worth trying.
         The new system takes the combined urine of the crew from the toilet and moves it to a big tank, where
    the water is boiled off, and the vapor is collected. The rest of the urine is thrown away. Then the water
    vapor is mixed with water from air, and then it goes through filters (过滤器). When six crew members are
    aboard, it can make about six gallons from urine in about six hours.
         "Some people may find the idea of drinking recycled urine distasteful, but it is also done on earth, but with
    a lot longer time between urine and the tap," said Marybeth Edeen, the space station's national lab manager.
         The technology NASA developed for this system has already been used for quick water purification (净化)
    after the 2004 Asian tsunami.
    1. According to the text, the recycling system is important because _____.
    [     ]
    A. it makes traveling to the moon for the average person possible
    B. with it NASA won't need to ship any water up to the space station
    C. it protects the environment in space by reducing the amount of waste
    D. it can help meet the need for more water after the crew is expanded
    2. Which is the RIGHT time order of the following events?
        a. The samples of the recycled water were tested on earth.
        b. Astronauts celebrated the space's first making water from urine.
        c. The recycling system was brought up to the space station.
        d. The technology for the system was used to quickly purify water.
    [     ]
    A. a, d, c, b
    B. a, c, b, d
    C. d, c, a, b
    D. d, a, c, b
    3. From Paragraph.5 we can know _____.
    [     ]
    A. the process of recycling urine
    B. the effect of the recycling system
    C. an opinion on recycling urine
    D. the theory behind the recycling system
    4. What is the best title for the text?
    [     ]
    A. Drink up: Space Station Recycles Urine to water
    B. New Technology Is Used in the Space Station
    C. The Research of NASA Has Made Great Progress
    D. Good News: Water Recycled from Urine Tastes Good
    1-4: DCAA
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