高考英語一輪復習總結(jié)測試unit1breakingrecords人教版選修-展示頁
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【正文】 gh which water cannot percolate．As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers．This causes a serious problem because plants require these nutrients for growth.Soil pHSoil can be acidic．neutral．or basic．The pH of the soil is determined by the nature of the rockfrom which it was formed．a(chǎn)nd by the nature of t}le plants that grow and rot in it．The acidity of rain and snow can lower the pH of the groundwater that enters the soil．By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils．When fossil fuels are burned．gases are released into the air and then fall back to earth as acid rain．Acid soil increases出e problem of carrying nutrients to lower soil levels．As nutrients are removed，soil is less fertile．Plants grow more slowly in acidic soil，and also bee easily attacked by diseases．67．The layer of soil that provides necessary nutrients for plant growth is called．A．1itter B．topsoil C．humus D．subsoil68．According to the text．which of the following is NOT true?A．Soil forms from weathered rock on the earth surface．B．The deeper layer of soil is darker in colour than t}le surface soil．C．Air pollution is partially responsible for acid soil．D．Groundwater tends to carry away nutrients for plant growth．69．We can infer from the passage that the water table lies ．A．between the topsoil layer and the subsoil layerB．in the subsoil layer above bedrockC．between the subsoil layer and bedrockD．in the bedrock layer beneath the subsoil70．The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are ．A．rushed away into the riverB．cleaned and purified by waterC．destroyed and carried away by waterD．mixed with water and bee part of itBDHolidaysHoliday News Vacations(空位) now and in the school holidays at a country hotel in Devon. This fortable, friendly homefromhome lies near the beautiful quiet countryside, but just a drive away from the sea. The food is simple but good. Children and pets are wele. Reduced prices for low season.The Snowdonia Centre The Snowdonis Centre for young mountain climbers has a mountain climbingLesson. The beginners’costs are 57 for a week, including food and rooms. Equipment is included except walking shoes, which can be hire at a low cost.You must be in good health and prepared to go through a period of body exercises. This could be the beginning of a lifetime of mountain climbing adventure. The world Sea Trip of a Lifetime Our Wirld Sea Trip of 2008 will be unlike any holiday you have ever been on before.Instead of one hotel after another, with all its packing and unpacking, waiting and tyavelling, you just go to bed in one country and wake up in another.On board
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