分析 本文主要講述了雨后河水顏色差異的原因.
解答 67:B細節(jié)題.由第二段第三、四句"The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖質(zhì)),which is black and gives the topsoil its dark colour.This layer is usually rich in nutrients,oxygen,and water."表層土由腐爛的植物和動物的糞便組成,該土壤富含營養(yǎng)物氧氣以及水.結(jié)合選項可知正確答案為B.
68:B由第二段倒數(shù)第二句"This layer is lighter in colour because of the lack of humus."可知深層的土壤顏色淺于淺層土壤,所以B項正確.A項,由第三段前兩句"Soil forms from the bottom up.Over time bedrock is attacked by rain,wind,frost,and snow.It is gradually broken down into smaller particles in a process called weathering."可知A項符合文意,所以A項錯誤.C項,由最后一段第三句"When fossil fuels are burned,gases are released into the air and then fall back to earth as acid rain."可知C項符合文意,所以C項錯誤.D項,由第五段第一句"As water percolates downward,it dissolves organic matter and minerals from the soil and carries them to deeper layers."可知D項符合文意,所以D項錯誤.故正確答案為B.
69 C:由第四段第四、五句"Eventually the water reaches a layer called the water table.Under this is bedrock through which water cannot percolate."可知 water table 就在 bedrock 上方,而前文講到 bedrock 上面的土層是 subsoil,由此可知 water table 在 bedrock 和 subsoil layer 中間,故正確答案為C.
70:D由第五段第一句"it dissolves organic matter and minerals from the soil and carries them to deeper layers."可知有機物和礦物質(zhì)被水 dissolve 后被帶到更深層去,所以推斷它們沒有被水破壞而只是和水混合在了一起,故正確答案為D.
點評 本文是廣告布告類閱讀理解.做這類題材閱讀理解時要求考生對文章通讀一遍,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).
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