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图甲为女性生殖系统结构简图,图胎儿发育期间营养供应的相关结构图,请根据图回答问题。 1请标出图甲中以下结构的名称。(1)_(2)_(3)_ 2(3)两项主要功能_。受精作用发生在_(填序号。) 3受精卵分裂和胚胎发育初期的营养由_提供? 4胚胎植入子宫内膜厚在胚胎与子宫壁接触的部分形成A__。 5胎儿通过A和B,从母体内获得__,并将代谢产生的__气体和其他废物排入母体的血液,由母体排出。
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【简答题】As we know, it is common for people to catch a cold in winter and most people believe they know the reason for colds. However, scientists say people have some wrong beliefs about the cause of colds. M...
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