下列选项中，属于证券交易内幕信息的知情人的有（ ）。
①发行人的董事
②持有公司5%以上股份的股东
③由于所任公司职务可以获取公司有关内幕信息的人员
④发行人控股或者实际控制的公司及其董事、监事、高级管理人员；

A.可不设二沉池
B.实现了生物固体平均停留时间与污水的水力停留时间的分离
C.膜组件中，膜材料常用反渗透膜
D.膜生物反应器分好氧和厌氧两大类

A．He brings him to the race-course and together they gaze into the starry night sky
B．He brings me to the wilderness to look at the stars
C．He holds him in his arms and comforts him
D．He invites him over to his house and makes him herbal tea