其高者，因而 ① 之；其下者， ② 而竭之。(《素问·阴阳应象大论》)
参考答案：①越 ②引
They are always singing songs to ________ their spirits when they meet with trouble.[ ]
A. keep off
B. keep back
C. keep up
D. keep on
主要受血糖浓度影响其分泌的是
A．生长素B．甲状腺激素C．甲状旁腺激素D．糖皮质激素E．胰岛素
