Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice. The various minority groups in the United States, such as Asian-Americans, Black Americans, Hispanic Americans and Native Americans, are attending schools and Colleges in great numbers. Students from some of these groups typically experience greater academic success than the average white majority student. Among the most successful students are Asian-Americans, whose families came from such countries as China, Japan, Korea and Vietnam. Although Asian-Americans make up only 2.1 percent of the population of the United States, they are surging into the nation's best colleges like a tidal wave. The extraordinary record by Asian-Americans has prompted a new series of studies to find out what lies behind their success. So far there is little agreement on the answers. Some scholars believe Asians are generically (在遗传方面) superior, possessing higher I. Q. s. They suggest that Chinese and Japanese babies arc more alert and sensitive at birth, making them faster learners. Other specialists feel that the secret is cultural, rooted in the emphasis Asians place on the traditional Confucian values of education and the family. Still others note that the Asian-American children doing so well today are the offspring of a unique group of immigrants drawn largely from intellectual and professional elite of their home countries. Why, they ask, didn't earlier generations of students from the nation's older Chinatowns do as well as Asian-American youngsters perform. now? In seeking to explain differences in academic performance, University of Michigan psychologist Harold W. Stevenson discounts the genetic factor. 'We didn't find any difference in I.Q.,' he said. 'But if the differences are already appearing at age 5 in kindergarten, there must be something in the home.' It is here that almost all the studies converge. They find that Asian or Asian-American parents are able to instill in their children a much greater motivation to work harder. 'My bottom line is, there's no question these Asians are working a heck of a lot harder,' said Sanford M. Dornbusch, professor of sociology and education at Stanford University. This passage is concerned mainly with ______.