题目

The number of people who ____ English as a foreign language ____ more than 750 million.     A. learns; is          B. learn; are           C. learns; are         D. learn; is   答案：D 某人向圆内投镖，如果他每次都投入圆内，那么他投中正方形区域的概率为 [　　] A． B． C． D．