题目

BEIJING — China's education authority will tighten the widely criticized policy of “extra credits” for the national college entrance examination to ensure a fairer chance for all exam-takers. Under the policy, high school students who win awards in national Olympic competitions could get ‘‘extra credits’, up to 20 points for the national college entrance exam. Students with talent in sports and students who are from ethnic groups can also benefit from this policy. The extra credits have increased these students' chances of being admitted by famous universities. Some paren如果用图A表示细胞核、染色体、DNA和基因之间的关系，下列选项中与图示相符的是A．1细胞核   2染色体   3DNA 4基因B．1细胞核   2DNA   3染色体   4基因C．1细胞核   2基因   3染色体   4DNAD．1细胞核   2染色体   3基因   4DNA