[解析]
(1)C 细节理解题.根据第一段话说Harvard和MIT联手向全球免费提供网上课程及第二段话"a number of courses developed by teachers at both universities will be offered online through a new $60 million program,known as edX"可知edX是这两所大学联手打造的一个网上免费授课的平台.故答案选C.
(2)A 细节判断题.B项应是2,000 classes;C项,应是100多万人使用,而不是完成了课程;D项文中没有谈到它们的课程是否相似.根据倒数第二段话"Other universities,including Stanford,Yale and Carnegie﹣Mellon,have been experimenting with teaching to a global population online"可知答案选A.
(3)B 词义推断题.此句的字面意思为"系好安全带".结合文章的意思便是为这些大学在网上开设免费课程这一教育的变革做好准备.故答案为B.
(4)C 细节理解题.根据第三段"In December,the school announced it also would begin offering a special certificate,known as MITx,for people who complete certain online courses"可知MITx是承认修完课程的证书.故答案选C.