以下各项属于高危妊娠范畴的有
A．宫内孕41周
B．双胎妊娠
C．胎盘功能不全
D．有剖宫产史
E．有卵巢手术史
参考答案：B,C,D,E
The scientist made several discoveries, _______. [ ]
A. which we think are important
B. which we think that is important
C. we think which are important
D. which we think is important
男性，10岁。体检发现P79次／分，脉律不整，吸气时脉律增快，呼气时减慢。这是由于（）
A.交替脉
B.奇脉
C.房颤
D.房早
E.窦性心律不齐
