31. What is the main idea of this passage?
(A) A teacher needs to be an expert in subject matters to teach students well.
(B) A teacher will have more answers if he /she tries not to be an expert.
(C) A teacher is merely obligated to succeed in teaching school subjects.
(D) A teacher should teach to improve students’ self-images.
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統計: A(3), B(5), C(1), D(1), E(0) #802479
統計: A(3), B(5), C(1), D(1), E(0) #802479