What do you usually use mobile phones for? Sending text messages for fun? Playing games? Well mobile phones can do   16   more than that.  17  this year’s Asian tsunami(海啸), mobile phones saved many  18  . More than 10,000 international phones were  19  when the tsunami hit. Police __20__ text messages to them and found __21__ than 2,000. But how? People  22   the signal and found out  23  the tourists were. So, how can  24  so small be so smart? Well here’s how! When you turn the phone  25  , it tries to find a signal. This signal comes from the telephone network.

   If you have a signal you can see it on the phone’s screen.  26  , if the signal is weak,  27  can be difficult to make a phone call. When the phone is finding a signal, it also sends a  28   to the telephone network. This message tells the station where the phone is. When you start  29  a phone call, the telephone network tells telecommunications offices where you are. The office will find out who you’re calling then put you  30  to your friend!

(  ) 16. A. very     B. so     C. far      D. little

(  ) 17. A. While    B. During    C. At        D. When

(  ) 18. A. lives    B. animals   C. houses     D. troubles

(  ) 19. A. doing    B. working   C. functioning   D. using

(  ) 20. A. sent    B. to sent    C. have sent    D. were sent

(  ) 21. A. more    B. much    C. many     D. less

(  ) 22. A. heard    B. listened   C. followed    D. examined

(  ) 23. A. how     B. where    C. what      D. why

(  ) 24. A. something  B. nothing   C. everything   D. nothing

(  ) 25. A. on     B. off     C. in       D. at

(  ) 26. A. Sometimes  B. Sometime  C. Some times  D. Some time

(  ) 27.  A. he      B. it      C. they      D. you

(  ) 28.  A. information  B. word    C. message    D. note

(  ) 29.  A. to make  B. making   C. made   D. make

(  ) 30.  A. off     B. up     C. on      D. through

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