根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage．)

　　Pollution means contaminating the Earth's environment with materials that people's 　　1　　 and lower their quality of life．Pollution can also 　　2　　 animals and plants．　　3　　 many different forms of pollutions．The three 　　4　　 are air pollution, land and water pollution．

　　Air pollution comes from different sources－not 　　5　　 of them are man-made．For example, dust storms in deserts and the smoke from forest fires are natural sources of air pollution．In urban areas, dirty air is more noticeable 　　6　　 the fumes from traffic and the waste from factories．Air pollution can 　　7　　 humans by causing sore eyes and respiratory 　　8　　, especially in children and the elderly．

　　Land pollution is caused by the deposit of soil waste that can't 　　9　　 quickly or at all．Land pollution can affect the lives of animals and plants, and it makes the environment look very 　　10　　 Recycling and reusing materials can help 　　11　　 the amount of land pollution．Other methods include landfill－using the rubbish to make new land－and burning the rubbish, 　　12　　 these two methods can pollute the water and air．

　　Water pollution results when substances are released into lakes, rivers, oceans, ect．Stay in the water or 　　13　　 at the bottom．This form of pollution may also begin in the air if the air is polluted and cause acid rain．When it 　　14　　, the rain will then pollute the water in lakes, rivers, oceans, ect．Soil erosion is one example of natural water pollution and can cause problems 　　15　　 the soil blocks the flow and leads to flooding．Pollution from human sources includes chemicals, pesticides, waste from factories and human sewage．

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完形填空。

　　Do you hope to move to another city or a foreign country?It may be interesting．But how about moving to 　　1　　 planet?A US company now has a plan：sending people to Mars 　　2　　 20 years．

　　To begin with,the company plans to send 　　3　　 people to go to Mars first．It will 　　4　　 them several months to get there．When they arrive,they will build a 　　5　　 first．

　　But Mars is not an easy place to 　　6　　．It is rocky,cold and has lots of sandstorms(沙尘暴)．Also,there is 　　7　　 air for breath．So people would have to live in a special house．They would have to 　　8　　 special clothes if they go out．

　　People will have to find 　　9　　 resources(资源),iron,water and so on．All these could help people live there…

　　Sounds interesting?You might want to go to Mars now．　　10　　 will things go well as the company hopes?We'll wait and see．

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完形填空

　　For me, Chirstmas always began in the middle of the cold, windy month of November．My sister Alice and I sat down in front of the fire and wrote a 　　1　　 to Father Chirstmas, telling him about all the presents we 　　2　　．We carefully posted the letter to“Father Christmas, the North pole”…

　　Christman Eve came, The whole family helped to 　　3　　 the house, put up the Christmas tree and blow up the balloons．Then, in the afternoon, when Aunt Kate and my two cousins arrived, 　　4　　 was ready．Before we went to bed, we left some wine and meat for Father Chirstmas and then put our 　　5　　 at the end of our beds．We tried to keep 　　6　　 as long as possible to see Father Christmas, but the next thing we knew it was 　　7　　 Christmas morning!

　　We couldn’t wait to 　　8　　 the stocking．It was now full of all kinds of small present and sweets．Christmas morning was bright and sunny．After going to church, my cousin David and I went out into the garden to 　　9　　 our new present．Lunch was always late, but what a lunch!Delicious turkey with all the vegetables followed by fruits and ice creams．

　　　　10　　 lunch, Father, Mother and Aunt rested on the sofas in front of the Queen’s speech on TV．We took out the toys, put on the funny paper hats, laughed at the jokes and played 　　11　　．Then came the afternoon tea and a large 　　12　　 cake covered with snowmen．It didn’t seem possible, 　　13　　 we still went on eating．By bedtime all of the children were very 　　14　　．As soon as Mom 　　15　　 the light, we all fell into a deep sleep．

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