题目

 --- Has ______ English changed over time?  --- “No”, he answered without ______ second thought.    A. /; the      B. /; a       C. the; the      D. the; a 答案：B从1到1O这十个自然数中随机取三个数，则其中一个数是另两个数之和的概率是（　　）A．16B．14C．13D．12