What can we learn from the passage？A．It"s scientific to classify people into different gro
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What can we learn from the passage？
A．It"s scientific to classify people into different groups according to their races.
B．The government didn"t pay enough attention on the issue of demographic shift.
C．The definite population of interethnic American is known.
D．The growing rate of interethnic Americans accelerates in recent years.
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
推理题。[A]讲到按种族将公民分类的问题，与文章开头所讲的人口普查局官员表示按种族划分公民是不可行的内容不符；[B]、[C]都涉及政府相关部门的工作，根据第五段第一句Suchaprofounddemographicshiftcouldtakeplacewhilenoonewaswatchingbecause，officially，noonewaswatching可以判断，政府对于种族变化问题重视不够，故[B]正确；根据本段最后一句Intheabsenceofamorestraightforwardcount，noonecouldknowforsurewhatthedemographicsare．可知，目前并没有种族构成的具体数据，排除[C]；[D]“异族通婚近年来增长速度加快了”在文中并没有提到。