Imagine the situation．You are driving along a desert or on a mountain．You have no idea where you are．You passed the last house two hours ago．Then your car breaks down．It is night and it is cold．You have no mobile phone．What do you do? Well, next time take a GPS with you．This invention may be able to help you．It is a device(裝置)which uses satellites(衛(wèi)星)to find the user's position(位置)．It can find your position to within 20 metres．A GPS cannot start your car, but at least you will know where you are．

　　GPS, which means Global Positioning System, is a small radio receiver．It looks like a mobile phone．You can hold it in your hand, or put in your pocket．It is sometimes put into a watch or a telephone．We also find GPS devices in cars, planes, or boats．Some of these devices have electronic maps, so you know where you are．For example, in a city they can tell you the name of the street．

　　There are three parts to the Global Positioning System．The first part is the receiver．You can hold it in your hand, or have it fixed into your car, plane, etc．The second part is a group of satellites orbiting the Earth．The receiver contacts at least four of the satellites and calculates(計(jì)算)its position．The third part of the system is a network of ground stations．They are all over the world．They control the satellites and make sure they are working well．

　　Some people think that in the future the GPS will be as common as the mobile．They are becoming cheaper and more and more accurate(精確的)．There are also new uses for the GPS．Perhaps they will become like watches．Everyone will have one and you will never be lost again．

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　　One evening after dinner, Mr．a(chǎn)nd Mrs．William called a family meeting．“We’ve had to make a difficult decision．” Mr．William announced．．

“You see, your mother has been offered a post as co-director of a television in Chicago．Unluckily, the station is not here．After thinking long and hard about it, we’ve concluded (下結(jié)論) that the right decision is to move to Chicago．”

　　Peter looked shocked, while his sister Amy breathlessly started asking when they’d be moving：“It’s surprising, but exciting!” she said．．

Peter simply said, “We can’t go －I can’t leave all my friends．I’d rather stay here and live with Tommy!”

　　Mr．a(chǎn)nd Mrs．William hoped that by the time they moved in August, Peter would grow more accustomed (習(xí)慣) to the idea of leaving．However, he showed no signs of accepting the news, refusing to pack his belongings (物品)．

　　When the morning of the move arrived, Peter was nowhere to be found．．

His parents called Tommy’s house, but Tommy’s mother said she hadn’t seen Peter．Mrs．William became increasingly worried, while her husband felt angry with their son for behaving so irresponsibly (不負(fù)責(zé)任)．

　　What they didn’t know was that Peter had started walking over to Tommy’s house, with a faint idea of hiding in Tommy’s attic (閣樓) for a few days．But something happened on the way as Peter walked past all the familiar landscape of the neighborhood：the fence that he and his mother painted, the tree that he and his sister used to climb, the park where he and his father often took evening walks together．How much would these mean without his family, who make them special in the first place? Peter didn’t take the time to answer that question but instead hurried back to his house, wondering if there were any moving cartons (紙板箱) the right size to hold his record collection．

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閱讀理解，閱讀下列短文，從每題所給的四個(gè)選項(xiàng)(A、B、C、D)中，選出最佳選項(xiàng)。

　　Did you know that a turtle(烏龜)can lay 12 eggs in one minute? A large sea turtle lays around 150 eggs at a time．She lays all these eggs in just a few minutes．

　　Large sea turtles live in the warm seas of the world．Except for when they lay their eggs, they spend their whole lives in the water．When it is time to lay their eggs, the females swim to land．

　　They usually return to the place where they themselves were born．How they find their way back there is unknown．

　　When they reach shore, the big, heavy turtles crawl slowly up to the high water mark．Using their flippers, they pull themselves along the sand．They must struggle like mountain climbers．When they finally reach dry sand, they rest before beginning the difficult task of laying eggs．

　　The turtles lay the eggs in deep holes and cover them with warm sand．The sand protects the eggs from harm．Then the females leave them．After a few weeks, if you happened to be walking along the beach, you might see the sand begin to shake．You may see tiny black balls coming out of the sand．The tiny heads of baby turtles!

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