题目

My brother is an active boy, he often risks _____ mountain with his friends.           A. climb       B. climbing    C. to climb    D. climbs 答案：B在一次口试中，考生从10道题中随机抽题进行回答，某考生会回答10道题中的6道题．（Ⅰ）若抽出1道进行回答，答对就通过考核，求考生通过考核的概率；（Ⅱ）若抽出3道进行回答，答对了其中2道就获得及格，求考生获得及格的概率．