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    It's hardly surprising that weather is a favorite topic for so many people around the world—it affects where we choose to live, what we wear, our moods, and perhaps even our national characteristics.Studies have shown that changeable weather can make it difficult to concentrate, cloudy skies slow down reaction, and hot，dry winds make many people bad­tempered.
    If you live in a place like Britain, where the weather seems to change daily if not hourly，you could be forgiven for thinking that the weather is random.In fact the weather is controlled by systems which move around areas of the globe.In the UK the weather depends on depressions (低压气流), often called lows，and anticyclones(反气旋)，also known as highs.These systems start in the Atlantic Ocean, and make their way across the British Isles from the west to the east.Highs bring sunny weather, while lows bring rain and wind.In modern times, human activities seem to be altering weather patterns.Gases produced by heavy industry change the temperature of the earth's surface，and affect cloud formation.Some researchers say that factories in Europe and North America may have been one of the causes of the droughts in Africa in the 1980s.
    The human race has always tried to guess the weather，especially in areas of the world where there are frequent changes.Traditional rhymes point to early attempts to identify weather patterns; popular poems include：
    Red sky at night, shepherd's delight；red sky in the morning, shepherd's warning.
    Flies will swarm before a storm.
    Rain before 7，clear by 11.
    While folk wisdom can provide a guide to help forecast weather, today's methods of prediction increasingly rely on  technology.Satellites, balloons，ships, aircrafts and weather centers with sensitive monitoring equipment, send data to computers.The data is then processed, and the weather is predicted.However，even this system cannot predict weather for longer than about a week.
    小题1:When weather keeps changing，________.
    A．people become bad­tempered
    B．people's reaction slows down
    C．people find it hard to focus on their work
    D．people find it easy to focus on their work
    小题2:The weather in Britain is________.
    A．randomB．moist
    C．depressingD．satisfying
    小题3:According to a traditional rhyme, if there is a red sky at night, the next day will be________.
    A．windy　B．rainy
    C．fine　D．snowy
    小题4:Which of the following statements is TRUE?
    A．Anticyclones often bring rain and wind.
    B．Weather forecasting has been done for a long time.
    C．Weather could never be predicted.
    D．Modern methods of weather prediction are developed from folk wisdom.
    小题5:What is mainly talked about in the second paragraph?
    A．Changes in weather.
    B．Weather in Britain.
    C．African droughts.
    D．Research on weather.

    小题1:C
    小题2:A
    小题3:C
    小题4:B
    小题5:A

    小题1:解析　细节理解题。由第一段中的“Studies have shown that changeable weather can make it difficult to concentrate...”可知研究表明多变的天气使人很难集中精力。
    答案　C
    小题2:解析　细节理解题。根据第二段第一句可知答案为A。
    答案　A
    小题3:解析　推理判断题。根据文章中的“Red sky at night，shepherd's delight；red sky in the morning，shepherd's warning.”可知答案为C，此句相当于中国谚语“朝霞不出门，晚霞行千里。”
    答案　C
    小题4:解析　细节判断题。根据第二段中的“anticyclones(反气旋)，also known as highs”和“Highs bring sunny weather”可知A错误；C项和文章内容不符；根据倒数第一段的第一句可知D错误。根据第三段的内容可知B正确。
    答案　B
    小题5:解析　段落大意题。根据第一段谈到的话题和此段第一句可知，作者以英国天气为例说明天气的变化。
    答案　A
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    A.

    		B.

    C.

    		D.

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