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

　　Passage 4

　　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(小冊子) 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 misrepresenta-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 (退賠 ) made if it is justified—none will be made if it isn't.

　　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