何谓进行性肌营养不良症(PMD)?
参考答案：
是一组以缓慢进行性加重的对称性肌无力和肌萎缩为特点的遗传性肌肉病变。
A．May 29th.
B．June 29th.
C．July 29th.
D．April 29th.
Listen! There must be someone _________ through the jungle.
A. trek B. treking C. trekking
