2010年12月英语四六级考试阅读专项练2.docVIP

2010年12月英语四六级考试阅读专项练习(4) 更新日期：2010-10-23 16:18 ????浏览: 266次????所属分类/专题：四级阅读 Passage 2 　　Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hours __11__ one of the scientists wrote in his book, Look here for __12__ metal. Scientists in another airplane, flying over a mountain region, sent a __13__ to other scientists on the ground, Gold possible. Walking across hilly ground, four scientists reported, This ground should be searched for metals. From an airplane over a hilly wasteland a scientist sent back by radio one word, Uranium. 　　None of the scientists had X-ray eyes: they had no __14__ powers for looking down below the earths surface. They were __15__ putting to use one of the newest methods of __16__ minerals in the ground—using trees and plants as __17__ that certain minerals may lie beneath the ground on which the trees and plants are growing. 　　This newest method of searching for minerals is__18__on the fact that minerals deep in the earth may __19__the kind of bushes and trees that grow on the surface. 　　At Watson Bar Creek, a brook six thousand feet high in the mountains of British Columbia, 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 __20__ 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. 　　A. signs B. sufficiently C. locating D. affect 　　E. merely F. magic G. hints H. carefully 　　I. finding J. message K. flight L. probable 　　M. revealing N. based O. information 　　Passage 3 　　There are two factors which determine an individuals intelligence. The first is the sort of brain he is born with. Human brains differ considerably , some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low ord