A good teacher should encourage his students to the knowledge by themselves instead of just copying and memorizing what the teacher said in class.
A. expand
B. observe
C. digest
D. react
网友回答
A. expand
B. observe
(答案→)C. digest
D. react
解析：动词辨析。A扩张;发展;增长；B观察，观测；遵守；c消化,吸收,分类;D 反应；结合句意可知C正确。句意：好的老师应该鼓励学生自己消化吸收知识而不是只模仿和记忆老师所说的内容。