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What do you usually use mobile phones for?Sending text messages for fun?Playing games?Well, mobile phone can do f 1 more than that．D 2 this year’s Asian tsunami(海啸)，mobile phones saved many l 3 ．More than 10000 international phones were w 4 when the tsunami hit．Police sent text messages to them and found more than 2000．But how?People f 5 the signal and found out w 6 the tourists were．So, how can s 7 so small be so smart?Well, here’s how!When you turn the phone on, it tries to find a signal．This signal．This signal comes from the telephone network．
If you have a signal you can see it on the phone’s screen．Sometimes, if the signal is weak, i 8 can be difficult to make a phone call．When the phone is finding a signal, it also sends a m 9 to the telephone network．This message tells the station where the phone is．When you start to make a phone call, the telephone network tells telecommunication offices where you are．The office will find out who you’re calling then put you t 10 to your friend!
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How strong is a dollar bill? A dollar bill lasts about a year and a half. By that time, it is usually worn out (磨损) . A$5 bill lasts longer. It is not used as often as a dollar bill. A $ 100 bill lasts longer still.
All the bills are made from the same kind of paper. The paper is very strong. You can fold (折叠) a bill about 4000 times before it tears (撕破).
Suppose you have a torn bill. You can trade it in at a bank for a whole bill. You must have more than half of the torn bill.
The paper used to print money is different from any other paper. This paper has a special pattern (图案). No one can make the same kind of paper. Besides, making the same kind of paper is against the law.
1．A dollar bill lasts about ________ .
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2．Which of the following is TRUE?
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A．A $ 5 bill lasts longer than a dollar bill.
B．You can't fold a dollar bill.
C．You can't tear a dollar bill.
D．A $ 100 bill does not last long.
3．The paper used to make bills is ________ .
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4．How many times can you fold a bill before it tears?
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5．You can trade in a torn bill if you have ________ .
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