课时训练(二) ⅰ.阅读理解 a moocs(慕课)(massive open online courses)are free，but without tutoring，and are open to anyone，anywhere in the world.the courses are flexible－normally three to five hours of study a week－done at any time，short(5 to 10 weeks)and video-rich.they are also heavily dependent on crowd sourcing：you can discuss a course with fellow students through onli
