单项选择题

In only two decades Asian-American has become the fastest-growing U.S. minority. As their children began (1) through the nation’s schools, it became (2) that a new class of academic achievers was emerging. Their achievements are reflected in the nation’s best (3) , where mathematics, science and engineering departments have taken on a decidedly Asian (4) .(This special liking for mathematics and science is partly (5) by the fact that Asian-American students who began their education abroad arrived in the U.S. with a (6) grounding in mathematics but little or no (7) of English.) They are also (8) by the promise of a good job after college. Asians feel there will be less unfair treatment in areas like mathematics and science (9) they will be judged more (10) in something like engineering than with an arts degree.
Most Asian-American students (11) their success to the influence of parents who are determined that their children (12) full advantage of what the American educational system has to offer. A(An) (13) measure of parental attention is homework. Asian parents spend more time (14) their children than American parents do, (15) it helps. Many researchers also believe there is something in Asian culture that (16) success, such as ideals that stress family values and emphasize education.
Both explanations for (17) success worry Asian-Americans because of fears that they feed a typical racial image. Many can remember when Chinese, Japanese and Filipino (18) were the victims of social isolation. (19) , it was not until 1952 that laws were (20) giving all Asian immigrants the right to citizenship.

A.put down
B.got down
C.carried down
D.laid down