题目

某算法的部分流程图如图所示，执行这部分流程，依次输入5，6，7，则输出s时，s和a的值分别是（ ） A . -1，1 B . 1，1 C . 5，-1 D . 6，-1 答案：A My brother has been preparing carefully for the English exam, so that he can be sure of passing it at his first _______ A. request         B. attempt      C. promise                     D. purpose