Nowadays, there is a hotspot issue about a severe and strict teacher is more effective than a teacher with humor and approuchable, From my perspective, i disagree with this point of view for following reason.
The main reason of my prespective is that facetious teacher can make students like this course which the teacher teach. As we all konw that "interest is the best teacher", as long as students interet in the teacher, either his class, they may pay more attention on his class, thus the efficiency of study would be improve. we may take my elder brother for example, when he was a junior high school student, he didn't like math because the mathematics lesson was bored, since the teacher had been changed, who can taught them humorously, he began to like math and the score of math had been improved.Furthermore, it's easy to approach the friendly teacher who make students feel kind. so  when they have some problem with their study, they are more possible turn to the kind teacher instead of the strict teacher, for instance, my college English teacher Mr.Liu who was very strict and serious. when we have some questions, we weren't asking him because he would scold you. so the English score of our class are bad.Finally, humorous teacher can increase the activity of class. active class is very important that students can discuss with each other, concentrate on the focus, otherwise, a bored classroom climate is bad for our study.

All in all, that;s is why i intend to stand on the side that a teacher with humor is more efficient