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　　Miners work under the earth to collect coal．They have 　　1　　 jobs because sometimes the earth sinks or falls apart．When this 　　2　　, miners are trapped underground．They are buried．　　3　　 they don't have air to breathe, food to eat, and 　　4　　 to drink, they will die．They cannot go 　　5　　 any of these things for long, but the first is the most important．It is 　　6　　 to figure out where miners are and reach them 　　7　　．Trapped miners dream of being free and don't 　　8　　．

　　In July 2002, nine miners went to 　　9　　 in Pennsylvania．All of a sudden, there was a terrible 　　10　　．A wall broke apart and water flooded the area where the miners were working．　　11　　 came up to their collars．At first, the miners 　　12　　, but no one could hear them．Luckily, people on the surface figured out 　　13　　 the miners were and dug a breathing hole．Later, they 　　14　　 them messages from their families．Many people took part in helping to 　　15　　 them．After a period of several days, they brought the tired miners to the surface alive．

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完形填空

　　We have always been warned of the dangers of forest fires．They cause 　　1　　 to a forest．They kill many plants and animals in an eco-system, which is a group of living things and their environment．But have you ever heard of a forest fire that can be 　　2　　 for a forest? People start some of the fires with a special reason to actually do good to the eco-system．

　　In fact, fires are a natural part of any eco-system．Without fires, the oldest and largest trees would stop sunlight from reaching the forest floor．Fires can 　　3　　 some of these old trees．When the trees die, they provide something good for the earth．New trees can grow strong and healthy in their place．

　　Some trees even need fires to grow．These trees hold their seeds(种子)inside．Heat from a fire allows the coat of the seeds to open up．Then the seeds fall to the ground and have the 　　4　　 to grow/

　　Scientist, who know about nature’s needs, start some of these fires, called controlled burns．A fire is started and kept under control．This way, the fire does not spread out of the area or 　　5　　 a after forest fires, they can go hungry 　　6　　 their food has been damaged in the fire．Small, controlled fires mean than animals will not have to move far to find food．After some time, small plants begin to grow．Animals return soon after the plants return．This 　　7　　 makes an eco-system．

　　So the next time you hear about a forest fire, think about the good as well as the bad．It may take a new eco-system a while to return, but it will likely come back stronger and healthier than ever．

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阅读理解

　　There is not enough oil in the world now．As time goes by ,it becomes less and less ,so what are we going to do when it runs out? Perhaps we will go back to use horses ,carriages and bicycles．

　　In the Second World War ,some people didn＇t use gas made from petroleum(石油)in their cars．They made gas from wood and plants instead．The cars didn＇t go fast ,but they ran ,so this was better than nothing．However, in the future, we can＇t cut down all our trees to make gas; we need our trees for other things, too．

　　Besides different types of gas, we can also use electricity(电)to run our cars but first we must make the electricity! Some countries have coal and they make electricity with that, but we might not always have coal, either．Other countries have big ,strong rivers and they can use the power of water to turn turbines(涡轮机)and make electricity more easily and cheaply．

　　We are also able to get power from the ocean tides．We put turbines into the mouth of the river．Then the tide comes in ,the water turns the turbines and then it goes out ,it turns them again．

　　Which of these ways will be used to run our cars in the future?

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