-
Digital learning systems now charge students for access codes needed to complete coursework, take quizzes, and turn in homework.
2018年6月四级真题（第三套）阅读 Section B
-
Many of the access codes he's purchased have been required simply to complete homework or quizzes.
2018年6月四级真题（第三套）阅读 Section B
-
Research now shows that regular quizzes, short essays, and other assignments over the course of a term better enhance learning and retention.
2017年12月四级真题（第一套）阅读 Section B