单选题
For the past two years, I have been working on students evaluation of classroom teaching. I have kept a record of informal conversations【C1】______some 300 students from at【C2】______twenty-one colleges and universities. The students were generally【C3】______and direct in their comments【C4】______how course work could be better【C5】______. Most of their remarks were kindly【C6】______—with tolerance rather than bitterness-and frequently were softened by the【C7】______that the students were speaking【C8】______some, not all, instructors. Nevertheless, 【C9】______the following suggestions and comments indicate , students feel【C10】______with things-as-they-are in the classroom. Professors should be【C11】______from reading lecture notes. " It makes their【C12】______monotonous(单调的)." If they are going to read, why not【C13】______out copies of the lecture? Then we【C14】______need to go to class. Professors should【C15】______repeating in lectures material that is in the textbook. "【C16】______we" ve read the material, we want to【C17】______it or hear it elaborated on, 【C18】______repeated. " " A lot of students hate to buy a【C19】______text that the professor has written【C20】______to have his lectures repeat it."