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Flying over a desert area in an airplane, two scientists looked down with trained eyes at treesand bushes. After an hour's flight, one of the scientists wrote in his book, "Look here for probable metal. " Scientists in another airplane, flying over a mountain area, sent a message to other scientists on the ground, "Gold possible. " Walking across hilly ground, four scientists reported,"This ground should be searched for metal. " From an airplane over a hilly wasteland a scientistsent back by radio one word: "Uranium. "
None of the scientists had X-ray eyes: they had no magic power of looking down below theearth' s surface. They were merely putting to use one of the newest methods of locating minerals inthe s and plants as signs that certain minerals may lie beneath the ground on whichthe trees and plants are growing.
This newest method of searching for minerals is based on the fact that minerals deep in theearth may affect the kind of bushes and trees that grow in the surface.
At Watson Bar Greek, a brook(小溪)six thousand feet high in the mountains of British Columbia, Canada, a mineral search group gathered bags of tree seeds. Boxes were filled with smallbranches from the trees. Roots were dug and put into boxes. Each bag and box was carefullymarked. In a scientific laboratory, the parts of the forest trees were burned to ashes and small part was examined to learn whether there were minerals in it.
Study of the roots, branches, and seeds showed no silver. But there were small amounts ofgold in the roots and a little less gold in the branches and seeds. The seeds growing nearest to thetree trunks had more gold than those growing on the ends of the branches.
26. Scientists were flying over a desert or a hilly wasteland or .a mountain area in order tosearch forin the ground.
A. gold
B. silver
C. uranium
D. minerals
27. The study of trees, branches and roots shows that
A. there were larger amounts of gold in the branches than in the seeds
B. there were smaller amounts of gold in the roots than in the branches
C. there were less amounts of gold in the seeds growing on the ends of branches than seeds growing nearest to the tree trunks
D. there was more gold in the branches than in the roots
28. Which is the best title suggested below?
A. Scientists Searching for Metals with Special Power
B. New Methods of Searching for Minerals
C. Gold Could Be Found by Trees and Plants
D. A New Method of Searching for Minerals--Using Trees and Plants
29. Which of the following is NOT mentioned as part of a tree that can help find minerals?
A. Leaves
B. Roots
C. Branches
D. Seeds
30. The scientists were searching for minerals by using
A. X-ray
B. magic power
C. a special instrument
D. trained eyes
參考譯文
坐著飛機飛過一片沙漠之地，兩位科學家用訓練有素的眼睛察看下面的樹木和灌木叢。經過大致一小時的飛行觀察後，其中一位科學家在他的本子上寫下這樣一句話“看這裡可能有金屬礦藏。”另一架飛機上的科學家們正飛過一座山區。他們給地面觀察站的科學家們發了“可能有金礦”的資訊。步行越過山地，四名科學家得出報告：“應該在此地尋找金屬礦藏”。從飛過多山丘的荒原的飛機上，一位科學家用無線電發回一個字：“鈾”。
沒有一個科學傢俱有x射線那樣的眼睛：他們並沒有看透地球表面的魔力。他們僅僅使用了一個最新的技術來定位地下的礦藏…樹木和植被長在地上，通過他們能顯示出某種埋藏在地下的礦物。
這項最新的尋找礦藏的技術是依據這樣一個事實，即處在地下的礦物會影響到地面上灌木和樹木的生長。
沃森巴溪是加拿大英屬哥倫比亞一座6，000英尺的山上的一條小溪。一隊礦藏搜尋小組收集了許多包樹木的種子;盒子裡盛滿了小樹枝。樹根也被挖掉放進盒子裡。每個包和盒子都被仔細標記了。在科學實驗室內，樹枝被燒成灰然後做檢測。檢查每個細小的部分是否含有礦藏。
對樹根、樹枝和種子的`檢測並沒發現銀元素，但卻在樹根部發現了部分金元素，同時在樹枝和種子中也發現了較少的金元素。長在最接近樹幹上的種子要比長在樹枝根部的種子含金元素多一些。
答案及解析26.D【解析】語義理解題。根據文章第一段的內容提到各種金屬，而這些金屬元素是包含在礦(mineral)裡的。故本題選擇D.
27.C【解析】細節題。從文中最後一句"The seeds growing nearest to the tree trunks had more gold than those growing on the ends of the branches."(長在最接近樹幹上的種子比長在樹枝根部的種子要含有更多的金元素)可知答案。故本題選擇c.
28.D【解析】主旨題。通讀全文可知文章的大部分(第二至五段)都在講述通過植物來尋找礦藏。故本題選擇D.
29.A【解析】細節題。從最後一段可知，通過研究roots，branches和 seeds可判定地下是否有礦產，而leaves在文章中卻沒有提到。故本題選擇A.
30.D【解析】細節題。從文章第一段的第一句"two scientists looked down with trained eyes at trees and bushes(兩位科學家用受過訓練的眼睛觀察樹木和灌木)可知答案。故本題選擇D.
