The most common causes of premature birth are（）
A. Severe preeclampsia
B. Infection of the lower genital tract
C. The incompetence of cervical internal opening
D. premature rupture of fetal membranes
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The main productive force in childbirth is（）
A. Uterine contractility
B. Diaphragm contractility
C. Levator ani muscle contractility
D. Abdominal muscle contractility
The following statements about ectopic pregnancy are wrong（）
A. The most common cause of tubal pregnancy is inflammation of the fallopian tubes
B. Tubal pregnancy abortion is the most common result of fallopian tube ampulla pregnancy
C. A tubal pregnancy is most common in the ampulla
D. Ectopic pregnancy means that the fertilized egg is implanted outside the uterus
Necessary conditions for fertilized egg implantation are（）
A. pregnant women secrete a sufficient amount of progesterone
B. transparent band disappears
C. blastocyst and endometrium develop synchronously and function coordinately
D. blastocyst trophoblast differentiates into syncytiotrophoblast
The function of the placenta includes（）
A. Substance Exchange Function
B. Synthetic function
C. Defense function
D. Immune function
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