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How any fetus survives gestation has baffled scientists for decades: the embryo’
How any fetus survives gestation has baffled scientists for decades: the embryo’
游客
2025-02-22
20
管理
问题
How any fetus survives gestation has baffled scientists for decades: the embryo’s tissues are half foreign and yet, unlike______organ transplant, it isn’t normally rejected.
选项
A、an adaptive
B、a mismatched
C、a successful
D、an obdurate
E、a preplanned
答案
B
解析
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