[单选]

The symptoms of the disease manifested themselves ten days later.  

She felt that she had done her good deed for the day.  act。 homework。 justice。 model。 The country was torn apart by strife.   poverty。 war。 conflict。 economy。 Some of the larger birds can remain stationary in the air for several minutes silent。 motionless。 seated。 true。 The original experiment cannot be exactly duplicated.   reproduced。 invented。 designed。 reported。 The group does not advocate the use of violence. limit 。 regulate 。 oppose 。 support 。

The symptoms of the disease manifested themselves ten days later.