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Flying over a desert area in an airplane, two scientists looked down withtrained eyes at trees and bushes. After an hour's 11 one of the scientists wrotein his book, "Look here for 12 metal. " Scientists in another airplane, flyingover a mountain region, sent a 13 to other scientists on the ground, "Goldpossible. " Walking across hilly ground, four scientists reported, "This groundshould be searched for metals. " From an airplane over a hilly wasteland ascientist sent back by radio one word, "Uranium. "大学英语四级考试流程

None of the scientists had X-ray eyes: they had no 14 powers for lookingdown below the earth's surface. They were 15 putting to use one of the newestmethods of 16 minerals in the ground—using trees and plants as 17 that certainminerals may lie beneath the ground on which the trees and plants aregrowing.

This newest method of searching for minerals is 18 on the fact thatminerals deep in the earth may 19 the kind of bushes and trees that grow on thesurface.

At Watson Bar Creek, a brook six thousand feet high in the mountains ofBritish Columbia, Canada, a mineral search group gathered bags of tree seeds.Boxes were filled with small branches from the trees. Roots were dug and putinto boxes. Each bag and box was 20 marked. In a scientific laboratory the partsof the forest trees were burned to ashes and tested. Each small part wasexamined 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 14. F 15. E 16. C 17. A 18. N 19. D 20. H