《素问·六节藏象论》所说的“封藏之本”，是指（）
A.肺
B.脾
C.肾
D.肝
E.心
参考答案：C
常出现“首剂现象”的抗高血压药物是
A．肼屈嗪
B．哌唑嗪
C．胍乙啶
D．硝苯地平
E．硝普钠
Three-fourths of the homework _____today.
A．has finished
B．has been finished
C．have finished
D．have been finished
