单选题 Many teachers believe that the responsibilities for learning lie with the student. 1 a long reading assignment is given, instructors expect students to be familiar with the 2 in the reading even if they don"t discuss it in class or take an exam.
The 3 student is considered to be 4 who is motivated to learn for the sake of 5 , not the one interested only in getting high grades. Sometimes homework is returned 6 brief written comments but without a grade. Even if a grade is not given, the student is 7 for learning the material assigned. When research is 8 , the professor expects the student to take it actively and to complete it with 9 guidance. It is the 10 responsibility to find books, magazines, and articles in the library. Professors do not have the time to explain 11 a university library works; they expect students, 12 graduate students, to be able to exhaust the reference 13 in the library．Professors will help students who need it, but 14 that their students should not be 15 dependent on them. In the United States, professors have many other duties 16 teaching, such as administrative or research work 17 , the time that a professor can spend with a student outside of class is 18 . If a student has problems with classroom work, the student should either 19 a professor during office hour 20 make an appointment．