引起前置胎盘病因有（）
A.前次剖宫产
B.多次人工流产
C.盆腔炎
D.吸烟
E.服用可卡因
参考答案：A, B, D, E
短文填空：(用所给的单词填空,每词只准用一次)。
( am warm favourite fly like cold windy is in cool fall at )
My name 1_____ Lucy. I 2_____ 12 now. My birthday is 3_____ October. I 4_____ fall best.
It's 5_____ and 6_____. I can 7_____ kites. My sister Lily doesn't like 8_____. Her 9_____ season
is spring. It's 10_____.
可编程逻辑控制器的简称是（）。
A、DCS
B、ESD
C、PLC
D、FSC
