()是维生素B2缺乏所造成的。
A、贫血
B、夜盲症
C、克山病
D、脂溢性皮炎
参考答案:D
胞衣不下是指胎儿娩出后,经多久胎盘仍不能自然娩出者()
A.120分钟
B.50分钟
C.60分钟
D.90分钟
E.30分钟
Marsha thought her friends would do something ______ to celebrate her birthday,
but they just gave her a birthday card. [ ]
A. correct
B. honest
C. quick
D. special