与发生前置胎盘关系最小的病因是
A．曾患产褥感染B．受精卵滋养层发育迟缓C．胎盘面积过大D．多次行人工流产术E．本次妊娠患先兆子痫
参考答案：E
根据汉语提示，用词组的正确形式填空。
1. It is impolite to _______ those persons in trouble. (嘲笑)
2. Don't let yesterday _______ _______ too much of today. (用光)
3. I tried to make my mother pay _______ _______me. (对……注意)
4. We should not _______ _______ our parents. (使……失望)
5. The music _______ me _______ Brazilian dance music. (使……记起)
