A: I feel rather sick this morning. I don't think I can concentrate on the work. B: ______ A: I'm not sure, but I have got a bad headache.

A．How long have you been sick

B．How are you feeling now

C．Do you have a high temperature

D．I'm sorry to hear that and I can't help you now.

上海证券交易所资金的清算、交收以结算参与人在该所取得的( )为明细核算单位。

A．清算编号

B．资金账户

C．交易席位

D．证券账户