特岗教师考试

【单选题】Passage 2Flying over a desert area in an airplane,two scientists looked down with trained eyes at trees and 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、“The ground should be searched for metal.”From an airplane over a hilly wasteland a scientist sent there by radio one word:“Uranium.”None of the scientists had Xray eyes:they had on magic powers of looking down below the earths surface.They were merely putting to use one of the newest methods of locating minerals in the ground,using trees and plants as signs that certain minerals may lie beneath the ground on which trees and plants are growing.This newest method of searchng for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface.At WestonBar Greek,a brook six thousand feet high in the mountains ofBritishColumbia,Canada,a mineral search group gathered bags of tree seeds.Boxes were filled with small branches from the trees.Roots were dug and put into boxes.Each bag and box was carefully markeD、In a scientific laboratory the parts of the forest trees were burned to ashes and testeD、Each 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 of gold in the roots and a little less gold in the branches and seeds.The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches. 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.

网考网参考答案：A
网考网解析：
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