[单项选择]The reason some children are backward in speaking is that ______. A. they are unable to learn language rapidly B. their mothers are not clever about a child C. their mothers respond inadequately to their attempts to speak D. they are exposed to too much language at once
第1题: [填空题]下面程序的输出结果是 【7】 。 #include＜iostream.h＞ int add(int a, int b); void main（ ）extern int x, y; cout＜＜add(x, y)＜＜end1;int x(20),y(5); int add(int a, int b)int s=a+ b; return s;
