2. 外语
  3. How any fetus survives gestation has baffled scientists for decades: the embryo’s tissues are half foreign and yet, unlike______

How any fetus survives gestation has baffled scientists for decades: the embryo’s tissues are half foreign and yet, unlike______

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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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