单卵双胎中根据胚胎分裂的时间,分成不同类型,下列哪一时期形成的单卵双胎的比例最高()
A.分裂发生在桑椹期
B.分裂发生在晚期囊胚
C.发生在羊膜囊形成后
D.发生在原始胎盘形成后
E.发生在胚胎形成后
第1题
_____ , I would accept the invitation and go to the party.
A、Were I you
B、Was I you
C、Had I been you
D、Would I be you
第2题
How will you make a reply if you accept the invitation?
A.Write to Professor and Mrs. Charles Gordon
B.Go directly on that day with the invitation
C.Make a phone call
D.Call the colleague club
第3题
第4题
What should be repeated when you accept an invitation over the telephone?
You should repeat four things: the day of the week, ______, the time and the place.
第5题
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