46. The special education mentioned in the text is mainly concerned with

　　A. genius students from day care centers to colleges

　　B. students who are fond of computer video games

　　C. teachers of language in the University of Arizona

　　D. students who are either mentally or physically disabled

　　47. A videodisc courseware is beneficial to those who have study difficulties because _

　　A. its fancy design is very attractive

　　B. it allows the user to go back to where he wants to restudy

　　C. the content of it is healthy and promising

　　D. it is developed by university professors

　　48. According to Professor Healey we may infer that mentally retarded children perhaps

　　A. need graphic representations in order to understand higher order language concepts

　　B. are good at study English idioms but often fail to grasp higher order language concepts

　　C.are not very patient with videodisec videodisc which helps them to understand the world concepts

　　D. tend to be deaf as well and have difficulty in learning the simple concept "before and after"

　　49.The best phrase that summarizes the main idea of the text is

　　A. handicapped students and their problems

　　B. videodisc and special education

　　C. computer assisted teaching programs

　　D. normal children and handicapped kids

　　50.The word "impairment "in the fa'st paragraph probably means

　　A. habit 　　B. disability 　　Ｃ. misconception 　　D. belief

　　Passage 5

　　Why do men have to pay for brides in some cultures, while in others women must havedowries in order to marry?

　　The price a man must pay for a wife varies form culture to culture. In East Africansocieties where cattle are the primary currency, a bride can be worth anywhere from 5 to 50cows, depending on the particular society and its resources. Men elsewhere trade pigs, goats,shells, metal tools, such as axes and knives, or money for wives. These payments called thebride-price, or bride-wealth, are given to the bride's male relatives by the groom and his malerelatives. In many societies where the bride brings dowry to the marriage, however, 'there is noexchange of wealth between families; the wife's dowry——land, household furnishings orjewelry——typically remains her own property. It seems then, that men buy wives but women don't buy husbands. Why is this? And whatis it that makes some women worth more than others?

　　In about half the societies studied by anthropologists, men must pay for wives. These aregenerally patrilineal (~ ~) societies, where wealth is passed down from father to son. Bride-price, also called bride-wealth, does not occur as often in matrilineal societies, and men pass ontheir wealth to their sisters' sons. Are women worth less in these societies? "There is no human society in which women arenot considered valuable," says the University of Washington anthropologist, Pierre van denBerghe, "They are the only means available to the male for passing on his genes."