are they teachers?

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I've got mad on most of the course in my university where teachers are nothing but obstacle on my way to develop my interest. I study hard and keep remarkable study method thanks to which i got great score. however, my teachers can never gave a satisfactory answer to the question I asked after class. what they could do is to bring more formulars to remember. they do introduce some advanced technology or new information refering to the area they teach. However, only a mere mention of the new application without any clear explanation of how the theory we learned were applied. so this kind of "expeanding our mind" are of no use at all. what is worse, when i just asked the teacher a question in the our homework, to my surprise she said where this question come from. when i told her from your assignment, she replied she even had not a look of the textbook she taught. she made little preparation before class using the slides prepared by her assistant to teache us, so you can imagine she read them line after line. i like biology, but this semesster we have only course that has a little connection with biology, analytic chemistry, in which i met such a teacher. listening her class is a kind of wasting time, for i get no idea what she was talking about in the class. after class, i reading textbook by myself, what she taught in three class cold be finished by me in just one class. whenever i turn to her for help, she could not answer my question, regardless difficult or simple. looking it over online yourself. that case is the same with my physics teacher. of course , i can read more books myself. i can get online for answer. however, it is unnecessary for me to spend long time finding the answer to each simple question which the teacher is supposed to be give some explanation. such circumstance frustrates me terribly! what should i do? i find only joy when discussing problems with my partner. however, there are times neither of us could work them out. my interest in biology fade. i think interest is not what we born into but cultivated by fertile soil as well. what should i do?