帕金森病临床表现运动迟缓或减少不包括（） A.言语减少，语音低沉、单调 B.转身困难

是合成酮体的关键酶

A．乙酰CoA羧化酶
B．HMG-CoA还原酶
C．HMG-CoA合成酶
D．HMG-CoA裂解酶

_____ about the safety of her son, John's mother looked upset. [ ]

A. Concerning

B. Concerned

C. To concern

D. Concern

I always wanted to do the job which I'd been trained _____.[ ]

A. on

B. for

C. by

D. of

静液压力梯度的大小与液体中所（）及气体浓度有关。