I. Introduction
In response to the impact of the epidemic on the implement of classroom teaching activity in colleges and universities in the spring of 2020, the Ministry of Education requires colleges and universities to actively carry out online teaching activities to strive for achievement that “suspending classes without suspension of teaching, suspending classes without suspension of learning”. In order to ensure the teaching progress and teaching quality during epidemical control period, almost all the colleges and universities rely on online teaching platforms and massive online resources to guarantee smooth knowledge communication which is supposed to be carried out by classroom teaching activities [1]. Based on a large number of online resources available, online teaching has made significant breakthroughs in diverse aspects and justified its specific benefits for homeschooled scheme.