支配心脏的交感神经节前纤维起于
A. 颈上、中、下神经节
B. 下位脊髓胸段侧角细胞
C. 上位脊髓胸段侧角细胞
D. 胸交感神经节
____________on for 3 hours in the night will make it hard for you to fucus on a lecture the next morning.
A. Party
B. Partying
C. Parted
D. Parting
Keep__________until you find what works for you and stick to it.
A. trying
B. waiting
C. tried
D. waited