人吸气时参与呼吸运动的有关肌肉及胸廓容积的变化是：膈肌 ，胸廓 。
收缩 扩大
骨干教师的专业发展阶段经历准备期、适应期、发展期和 ______ 。
—What's the meaning of the saying whenever you fall, pick something up?
—It tells us to___ __hope even when coming across failure; try to learn something valuable from it. [ ]
A. look for
B. call for
C. take up
D. give up
