题目

Education is an expensive part of American life．Its size is matched by its variety．Differences in American schools compared with those found in the majority of other countries lie in the fact that education here has long been intended for everyone．Schools are expected to meet the needs of every child, regardless of ability, and also the needs of society itself．This means that public schools offer more than academic subjects．It surprises many people when they come here to find high schools offering such courses as typing, sewing , radio repair, computer programming or driver training,研究土壤小动物时，错误的做法是（   ） A．取样用的塑料袋上标明地点和时间       B．用趋光法或者趋热法收集小动物 C．用标志重捕法估算蚯蚓的种群密度       D．不知名的动物标记为"待鉴定XX"