临产时的子宫收缩和疼痛，下列哪一变化最不可能产生（）
A.过度通气
B.每搏量增加
C.心排血量增高
D.血压升高
E.呼吸性酸中毒
参考答案：E
小题1: Mr. Chen is their _______ teacher.
A．English
B．history
C．science
D．P.E小题2:How many classes do they have on Monday morning?
A．Three.
B．Four.
C．Five.
D．Seven.小题3: Ben’s favorite subject is_______.
A．P.E
B．art
C．English
D．math小题4:They want to see ______________in the evening.
A．a cartoon
B．a comedy
C．a thriller
D．an action movie小题5:They have a party on _______.
A．May 29th
B．Friday
C．June 1st
D．Saturday
青蒿抗疟的有效成分为()
A．青蒿素
B．青蒿酸
C．青篙醇
D．青蒿内酯
E．挥发油
