已知选修课学生名单 course1 = {"张三", "李四", "王五"}, course2 = {"李四", "赵六", "王五"}。要找出同时选修两门课的学生，应使用的推导式是？（ ）
A：{x for x in course1 if x in course2}
B：[x for x in course1 and course2]
C：{x for x in course1 or course2}
D：{x for x in course1 if x not in course2}
正确答案：A
试卷来源：202506 青少年软件编程等级考试Python五级真题