脑压过低引起头痛的机制是
A．牵张颅内静脉窦B．脑膜炎C．脑部缺血D．脑部充血E．脑膜刺激征
参考答案：A
I secretly hid myself ______ the ship, Endurance, in a small cupboard(碗橱).
[ ]
A. board
B. aboard
C. abroad
D. being aboard
奏鸣曲式
