鼻周期的生理意义是()。
A.减低鼻腔阻力
B.增大鼻腔阻力
C.促使睡眠时反复翻身,减轻疲劳
D.增加肺泡气体交换
E.清除鼻腔中的异物或刺激物
参考答案:C
You have learned the poem by heart all right, but it doesn't _____ mean that you have fully understood its
meaning. [ ]
A. necessarily
B. simply
C. essentially
D. purposefully
简述教师在学与教过程中的地位。