多项选择题

孕产期保健服务包括哪些保健服务（）

A.孕前
B.孕期
C.分娩期
D.产褥期
E.以上都不是

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单项选择题

The purpose of the research on twins by Raiha and colleagues was to examine
A．the relationship between family members．
B．the effect of pain-releasing medicines．
C．the roles of genetic and environmental factors in the origin of ulcer．
D．the symptoms of ulcer．

A.the
B.
B．the
C.
C．the
D.
D．the

单项选择题

Raiha and colleagues found environmental effects related to all the following factors EXCEPT
A．the regular use of pain-releasing medicines．
B．shared exposure to Hpylori．
C．smoking．
D．stress．

A.the
B.
B．shared
C.
C．smoking．
D．stress．