They designed ways to test their solutions.

VOA: special.2010.03.11

You've got the model solutions, and there will be a test in recitation on Tuesday the 14th based upon that homework.

你们也有参考答案，在周二的背诵课上会有个测试,就是14号，基于你们的家庭作业。

麻省理工公开课 - 固态化学导论课程节选