气道重塑的病理生理表现为（）。
A.细胞增生
B.基质蛋白沉积增加
C.基膜增厚
D.血管新生
参考答案：A, B, C, D
职业性有害因素按其性质可以分为（）。
A.3类
B.4类
C.5类
D.6类
E.7类
In order to find ways of associating the new materials with ideas or objects with which the pupils are familiar, D.Ausubel would prefer ______.
A. straightforward explanation and exposition B. pupil-generated discovery methodsC. rote learning D. inductive and deductive inference
