单选题
The child's earliest words deal with concrete objects and actions, it is much later that he is able to grasp ______ .
【正确答案】
D
【答案解析】[解析] 本题的四个选项中，A项decisions的意思是“决定，决心；判断；结论”，B项abstractions的意思是“抽象；提取”，C项opponents的意思是“对手；敌手，反对者”，D项mathematics的意思是“数学”。