51. During the early development of a human embryo the_________eventually forms_________.
(A) blastocoel ... arch enter on
(B) epiblast...ectodermal, mesodermal, and endodermal tissues
(C) epiblast... placenta
(D) trophoblast... embryo proper
(E) hypoblast ... amniotic cavity

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統計: A(5), B(18), C(7), D(8), E(9) #2238524

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51. During the earl...
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embryo proper胚體(植物) 
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