单选题 The child's earliest words deal with concrete objects and actions, it is much later that he is able to grapple with ______.
【正确答案】 B
【答案解析】(abstraction抽象概念)。句意为：孩子最早的词语涉及到具体的物体和行为，到后来他能够努力地理解抽象概念。A．decision决定；C．opponent对手；D．mathematics数学。