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Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour"s __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 earth"s 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.考试大－全国最大教育类网站(www．Examda。com)
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
There are two factors which determine an individual"s 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 order of intelligence unless he has op
pportunities to learn. So the second factor is what happens to the individual— the sort of environment in which he is brought up. If an individual is handicapped(不利) environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.
The importance of environment in determining an individual"s intelligence can be demonstrated by the case history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster(抚养) homes. Peter was raised by parents of low intelligence in an isolated community with poor educational opportunities. Mark was reared in the home of well-to-do parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark"s I. Q. was 125, twenty-five points higher than the average and fully forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.
21. This selection can best be titled____________.
A. Measuring Your Intelligence B. Intelligence and Environment
C. The Case of Peter and Mark D. How the Brain Influences Intelligence
22. The best statement of the main idea of this passage is that _______.
A. human brains differ considerably
B. the brain a person is born with is important in determining his intelligence
C. environment is crucial in determining a person"s intelligence
D. persons having identical brains will have roughly the same intelligence
23. According to the passage, the average I. Q. is_______.
A. 85 B. 100
C. 110 D. 125
24. The case history of the twins appears to support the conclusion that_______.
A. individuals with identical brains seldom test at the same level
B. an individual"s intelligence is determined only by his environment
C. lack of opportunity blocks the growth of intelligence
D. changes of environment produce changes in the structure of the brain
25. This passage suggests that an individual"s I. Q. _______.
A. can be predicted at birth B. stays the same throughout his life
C. can be increased by education D. is determined by his childhood
As a reliable travel agency, we really do try to describe our centers and accommodation as realistically as possible. All our Super Centers and Main Centers have been extensively investigated during the winter season 1975-1976. As a result we have first-hand information on the way in which hotels, life networks and ski schools, etc. operate during the season. We have not been able to investigate, at first hand, all our Independent Centers during the last season but all have been visited during the past three seasons. Should you need any more information about these centers we will try to get it for you. Our American centers have been investigated on our behalf by United Airlines Tours Department and by the U. S. tour operators who are assisting United and ourselves to offer you this novel program to the United States.
Where possible we have eliminated the use of superlatives from the text (possibly making our brochure(小册子) less attractive to read than it might be) and have concentrated on as accurate a description as possible. Nevertheless you should bear in mind that your opinion and the opinion of our investigator might differ and there may be changes between the time of a visit by our investigator and the visit of one of our customers.
We trust that it is evident to you that we have done all in our power to eliminate misdescription and that there really is no question of misrepre
senta-tion on our part—either careless or otherwise. We welcome your constructive criticism—it is the best way we know of improving our brochures and our service. Although complaints are very expensive to handle, your complaint or criticism will be thoroughly investigated and a refund (退赔 ) made if it is justified—none will be made if it isn"t.来源：www.examda.com
26. The firm claims that all its winter sports centers have been the recent target of
A. a program of personal visits
B. intensive enquiries about facilities
C. attempts to increase hotel accommodation
D. an improved information service
27. The "Independent Centers" were personally inspected_______.
A. the year before last B. three years ago
C. between 1975 and 1976 D. within the last three seasons
28. The program of tours to the United States appears to be_______.
A. a new collaboration with U. S. travel firms
B. newly taken over by U. S. tour operations
C. a new independent venture
D. organized by United Airlines
29. Their brochure would be more attractive to read, they say, if_______.
A. it were less truthful B. it used fewer superlatives
C. it eliminated description D. it were more encouraged
30. The firm"s claim is that their program is improved by_______.
A. helpful fault-finding by customers
B. attractive description of the centers in every brochure
C. a standard policy of prompt repayment
D. careful control of the hotels
11. K 12. L 13. J 14. F 15. E 16. C 17. A 18. N 19. D 20. H
21. B 22. C 23. B 24. C 25. C 26. A 27. D 28. A 29. A 30. A