单项选择题

早期低钙血症，发生的时间为生后

A.36小时内
B.48小时内
C.72小时内
D.12小时内
E.24小时内
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听力原文：M: It is so hot today. I can't work. I wish I could leave this stuffy room to get some fresh air.W: So do I. But I have to finish my work even without the air-conditioner.What are these people talking about?A.The room.B.The heat.C.The workloaD.D.The air-conditioner.
A.W:
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听力原文：W: I wonder what I should say to my boyfriend when he comes latE.M: Well, I guess. It just depends on what kind of relationship you havE.The relationship between the two speakers is probablyA.intimate friends.B.man and wifE.C.psychoanalyst and patient.D.instructor and student.
A.M:
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