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    20．Imagine entering a very large building and you have no idea how to get to the office you are looking for．But then，as you're standing there，a nearly silent balloon floats（飘） over to you and speaks to you．It asks you where you want to go．You tell it，and then it simply says"follow me"like a child's game，and begins to float off in the direction of your destination．It keeps going，as you follow，leading you to where you want to go．
    The guide works itself，without any help from any human being．It says hello to people as they arrive in the building，speaks to them，processes their requests and then guides them to the destination．
    The balloon has two tiny fans to help keep it floating and to provide just a touch of lift．Onboard is a wireless （无线的） receiver for receiving directions from a computer that directs the fans and sensors （传感器） that let it know where objects are around it．
    The idea of such a simple robot is one that has been on the minds of scientists for years，and has been mentioned in novels many times．Today the iPhone does something similar but has to be connected to the Internet which is sometimes difficult．This is why this little balloon might be the wave of the future-because it is so much easier to follow!

    29．The balloon is used toA．
    A．lead the way        B．bring people joy
    C．catch the thief     D．welcome the visitors
    30．The balloon gets to know its position with the help ofA．
    A．sensors        
    B．two tiny fans
    C．a wireless receiver    
    D．human beings
    31．We can learn from the last paragraph thatD．
    A．the idea of the balloon is new
    B．the balloon is difficult to make
    C．the balloon will replace the iPhone soon
    D．the technology may become popular in the future
    32．The text is most probably from aA．
    A．science news report 
    B．newspaper ad
    C．book review     
    D．science novel．

    分析 本文主要介绍了一种能够为人们引路的机器人．

    解答 AA DA
    29  A  细节题．根据第一段and then it simply says"follow me"like a child's game，and begins to float off in the direction of your destination．描述的情景可推知，这个气球是用来引路的．故选A．
    30  A  细节题．根据第三段最后一句中的"…sensors（传感器）that let it know where objects are around it．"可知，它是凭借传感器来判断位置的．故选A．
    31  D  细节题．根据最后一段This is why this little balloon might be the wave of the future-because it is so much easier to follow!可知，该技术可能会在未来得到普及．
    32  A  细节题．本文主要介绍了一种能够为人们引路的机器人，属于科普范畴，故选A项．

    点评 做阅读理解时要快速的浏览全文，把握文章主旨大意，带着问题回到原文，寻找细节或概括相应的答案，最后要理清作者写作思路．

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    10．Many animals recognize their food because they see it．So do humans．When you see an apple or a piece of chocolate you know that these are things you can eat．You can also use other senses when you choose your food．You may like it because it smells good or because it tastes good．You may dislike some types of food because they do not look，smell or taste very nice．Different animals use different senses to find and choose their food．A few animals depend on only one of their senses，while most animals use more than one sense．
    Although there are many different types of food，some animals spend their lives eating only one type．The giant panda eats only one particular type of bamboo．Other animals eat only one type of food even when given the choice．A kind of white butterfly will stay on the leaves of a cabbage，even though there are plenty of other vegetables in the garden．However，most animals have a more varied diet．The bear eats fruits and fish．The fox eats small animals，birds and fruits．The diet of these animals will be different depending on the season．
    Humans have a very varied diet．We often eat food because we like it and not because it is good for us．In countries such as France and Britain，people eat foods with too much sugar．This makes them overweight，which is bad for their health．Eating too much red meat and animal products，such as butter，can also be bad for the health．Choosing the right food，therefore，has become an area of study in modern life．

    21．We can infer from the text that humans and animalsC．
    A．depend on one sense in choosing food
    B．are not satisfied with their food
    C．choose food in similar ways
    D．eat entirely different food
    22．Which of the following eats only one type of food？A．
    A．The white butterfly．
    B．The small bird．
    C．The bear．
    D．The fox．
    23．Certain animals change their choice of food whenA．
    A．the season changes
    B．the food color changes
    C．they move to different places
    D．they are attracted by different smells
    24．We can learn from the last paragraph thatD．
    A．food is chosen for a good reason
    B．French and British food is good
    C．some people have few choices of food
    D．some people care little about healthy diet．

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