[单选题]高压试验用接地线必须用多股裸铜线或外覆绝缘层的铜质软绞线，其截面应能满足试验要求，并不得小于()mm2。
A.1.5
B.2.5
C.4
D.6

In only two decades Asian Americans have become the fastest-growing U. S. minority (少数民族). As their children began moving up through the nation’s schools, it became clear that a new class of academic achievers was emerging. Their achievements are reflected in the nation’s best universities, where mathematics, science and engineering departments have taken on a decidedly Asian character. This special liking for mathematics and science is partly explained by the fact that Asian-American students who began their educations abroad arrived in the U.S. with a solid grounding in mathematics but little or no knowledge of English. They are also influenced by the promise of a good job after college. Asians feel there will be less unfair treatment in areas like mathematics and science because they will be judged more objectively. And the return on the investment in education is more immediate in something like engineering than with an arts degree.
Most Asian-American
A. feel they are mistreated because of limited knowledge of English
B. are afraid that their academic successes bear a strong Asian character
C. still worry about unfair treatment in society
D. generally feel it a shame to have to depend on their parents