股票投资组合的目的是实现平均收益。 ( )
参考答案：错
解析： 股票投资组合的目的是分散风险。
The old man sat in front of the television every evening, happy _____ anything that happened to be on.
A．to watch
B．watching
C．watched
D．to have watched
商务文书具有草拟、()、定稿、公布及操作的制发程序。
A.审核
B.登记
C.复核
D.签发
