题目内容

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

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1.麻醉分（）、（）和（）3类。

____________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

Setting aside enough time for study is a__________for every student.

A. must to
B. must do
C. must dos
D. must-do