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（飄） 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 （無線的） receiver for receiving directions from a computer that directs the fans and sensors （傳感器） 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(chǎn) 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 本文主要介紹了一種能夠為人們引路的機器人．

解答 AA DA
29  A  細節(jié)題．根據(jù)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，這個氣球是用來引路的．故選A．
30  A  細節(jié)題．根據(jù)第三段最后一句中的"…sensors（傳感器）that let it know where objects are around it．"可知，它是憑借傳感器來判斷位置的．故選A．
31  D  細節(jié)題．根據(jù)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，該技術可能會在未來得到普及．
32  A  細節(jié)題．本文主要介紹了一種能夠為人們引路的機器人，屬于科普范疇，故選A項．

點評 做閱讀理解時要快速的瀏覽全文，把握文章主旨大意，帶著問題回到原文，尋找細節(jié)或概括相應的答案，最后要理清作者寫作思路．

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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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