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    The amount of carbon taken in by growing plants increased from 1982 through 1999 as
    temperatures rose and the amount of carbon dioxide in the atmosphere increased. But a new study
    in Friday ’ s edition of the journal Science found a drought - related decline in such plant growth
    from 2000 to 2009，even though temperatures continued to climb.
    As drought caused by warming reduces the land ’ s ability to take in carbon，the result could
    be more carbon dioxide left in the atmosphere，and thus more warming，Zhao Maosheng from the
    University of Montana explained in a telephone interview.
    “This is a pretty serious warning that warmer temperatures are not going to endlessly improve
    plant growth ’” co - author Steven Running，also from the University of Montana ’ said in a
    statement. “ We see this as a bit of a surprise，and potentially significant on a policy level because
    previous interpretations suggested global warming might actually help plant growth around the
    world, “ he said.
    Instead, he and Zhao found a small but measurable decline of about 1%，compared to a6%
    increase in the past decade.
    Their study，based on the data collected by NASA satellites，found that north areas continued
    to increase plant growth，thanks to warmer temperatures and a longer growing season.
    Someone commented, "This past decade’ s net decline in earthly productivity suggests that a
    complex relationship between temperature, rainfall, cloudiness, and carbon dioxide, probably in
    combination with other factors such as nutrients(营养）and land management，will determine
    future patterns and trends in productivity.，，
    【小题1】From the first paragraph, we can learnin the recent decade or so.

    A．the emission(排放)of carbon hasn’ t been reduced
    B．draught has been causing loss of soil and water
    C．carbon dioxide levels have been rising
    D．the rise of temperature doesn' t promote the plant growth
    【小题2】Zhao Maosheng really worried that .
    E.     more and more land will be abandoned
    F.    the climate becomes warmer and warmer
    G.   the emission of carbon dioxide increases
    H.   draught further reduces the number of the plants
    【小题3】Steven Running made his statement to  .
    I.      confirm Zhao' s views on the influence of temperature rise
    J.     urge the government to take necessary measures
    K.    warn the people to strengthen the plant protection
    L.    support Zhao* s views on lhe plant production
    【小题4】We can infer from the passage that  .
    A．global warming will determine the future productivity
    B．various factors play a key role jointly on future productivity
    C．earthly productivity actually increased in the past decade
    D．temperature rise has had no effect on future producticity patterns

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                                                                     SELF STUDY TIPS
         However difficult you find it to arrange your time, it will pay off in the long run if you set aside a
    certain part of the day for studying－and stick to it. __1__ But don't forget to make sure that you
    have enough left for recreational activities or simply to be "with" yourself: reading a novel or watching
    a television programme.
         As part of your weekly schedule, it is also advisable to consider exactly what you have to do in that
    week, and make sure that you handle the most significant tasks first. __2__
         On a physical level, make sure you have an area or space for studying. __3__ If you always study
    in the same place, preferably a room of your own, you will find it easier to adjust mentally to the activity
    when you enter that area. You should have everything that you might need at hand.
         Make sure that all the physical equipment that you use, such as a desk, chair etc. is at good height
    for you. If you use a personal computer, there are plenty of guidelines available from the movement on
    angles, lighting and the like.   __4__
         If you are working on topic your teacher has set, but finding it hard to concentrate, it may be that you
    actually need to take your mind right off it for a period of time.  __5__ After a period away from the
    test, having not thought about it at all, you may return to it refreshed and full of ideas.
    A. It's wise to leave the easier or less urgent areas of your work until later.
    B. It's all too easy to read something and then forget where it came from.
    C. Consult these and avoid the typical student aches and pains.
    D. "Airing the mind" can work wonders sometimes.
    E. Make use of equipment that is available to you.
    F. It is best to make a weekly schedule.
    G. Don't do it just anywhere.

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    In order to continue to learn by  ourselves after leaving school, we must ____ learn  how to study
    in the school now.    
    [     ]
    A. after all      
    B. in all        
    C. above all    
    D. first of all

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