题目内容
（请给出正确答案）
A．How many weeks there are in a month.
B．Which days people should work.
C．How the week is divided into days.
D．Which day begins the week.
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B、礻
C、米
D、田
A、Neurulation
B、Gastrulation
C、Craniocaudal folding
D、Lateral folding
A、formation of the primitive streak
B、formation of the notochord
C、formation of the neural tube
D、form ation of extraembryonic mesoderm
A、extraembryonic coelom
B、intraembryonic coelom
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A、Start of week 3
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D、Start of week 8
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B、Ectoderm and mesoderm only
C、Ectoderm and endoderm only
D、Ectoderm,mesoderm,endoderm
A、syncytiotrophoblast only
B、cytotrophoblast only
C、syncytiotrophoblast and cytotrophoblast
D、syncytiotrophoblast and fetal endothelium
A、decidua basalis and secondary chorionic villi
B、decidua parietalis and tertiary chorionicvilli
C、decidua capsularis and villous chorion
D、decidua basalis and villous chorion
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