胃癌的发生与哪项化学因素有关 A．烷化剂 B．亚硝胺类 C．苏铁素 D．氨基偶氮类

根据短文内容，从下框的A – F选项中选出能概括每一段主题的最佳选项。选项中有一个多余选项。

	A．Being patient B．Being attractive C．Being sympathetic D．Being good-looking E.Going on learning F. Teaching the lesson in a lively way

 

 
The personal Qualities of a Teacher: What personal qualities should a teacher have? I think the following would be accepted by most of us.
1.
First, a teacher should be pleasantly live and attractive. It does not mean that the teacher should be good-looking, because teachers who are not good-looking might also have their personal charm. Anyway, they should not be boring.
2.
Secondly, it is basic for a teacher to be sympathetic----to understand the minds and feelings of other people. Closely related with this is the capacity to be tolerant (宽容) - indeed not of what is wrong, but of the weakness of human beings which make people, especially children, make mistakes.
3.
Thirdly, a teacher should be a bit of an actor. That is part of the skill of teaching, which means that every now and then a teacher should put on an act(装样子) to make his lesson interesting and vivid.
4
Fourthly, a teacher must sometimes show great patience. This is mainly a matter of self-training. None of us are born like that. Teaching requires great effort and a teacher should be able to deal with problem children.
5.
Finally, a teacher should have the kind of mind which always wants to go on learning. Teaching is a job in which a teacher will never be perfect. There is always something more to learn. There are three main subjects of study: the subjects which the teacher is teaching; the methods the teacher is using; the students whom the teacher is teaching. The two main rules of education today are that education is education of the whole person, and that it needs full and active cooperation between two persons — the teacher and the student.