发布时间：2017年05月31日
选词填空
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour's11one of the scientists wrote in his book, "Look here for12metal. " Scientists in another airplane, flying over a mountain region, sent a13to 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 no17powers for looking down below the earth's surface. They were17putting to use one of the newest methods of17minerals in the ground—using trees and plants as17that certain minerals may lie beneath the ground on which the trees and plants are growing.
This newest method of searching for minerals is18on the fact that minerals deep in the earth may19the 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 was20marked. 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
答案：11. K 12. L 13. J 17. F 17. E 17. C 17. A 18. N 19. D 20. H
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