Some species are better learner than others partly because______. A．some animals prefer to remain dumb B．some animals don't have a nervous system C．learning may endanger some animals' health D．they are better taught than others
A. A．some B.some C.learning D.they
【参考答案】
C 属逻辑关系题。通过题目内容可定位至文章第二段第一句。在第二段第二句中，作者就说明了导致这种学习能力差异的一个......