61（）

单项选择题Higher level classes are taught mainly through （）

A．giving a lot of lectures to students
B．involving students in discussions
C．asking students questions in class
D．answering students' questions in class

单项选择题What are students expected to do before attending a class（）

A．Go over the lessons thoroughly.
B．Understand the textbooks well.
C．Do the reading assignments.
D．Prepare an outline for discussion.