[单项选择]

Manners in school, as everywhere else, are importa

nt to happy relation within the group. Western manners in this situation differ only slightly from good Chinese (21)
If you are in a very large class, it may not be necessary to greet the teacher on (22) . In a small class the teacher will probably notice each person as he arrives, and you (23) smile and say, "Good morning, Dr fen." Western manners do not require you to stand up when your teacher comes in or when you answer a question (24) do you need to stand still at the door for a moment when you come in. One never addresses one’s teacher as "Teacher". It is quite (25) to say "sir" to a man, but if your teacher is a woman, you must use her surname.
It is bad manners to come late to class. If you are late, (26) should be made to the teacher either at the time or after class.
It is bad manners in the classroom, as elsewhere, to
A. or
B. nor
C. and
D. yet