Travel with the textbook. Where can I read the fourth grade volume for free?

CCTV.com, iQiyi. "Traveling with the Textbook" is a text in the first volume of fourth grade. This text was filmed into a documentary by CCTV. It is a large-scale experiential cultural education program that allows you to "read thousands of books" and "travel thousands of miles" at the same time. The film covers a wide range of areas, which is surprising: tracing the Hexi Corridor, Chang'an and Suzhou gardens, Turpan and Shaanxi folk custom imprints, grasslands, mountains and seas. Favor.