阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。
More than half of rich Americans have not shown their full wealth to their children，a new survey showed last Tuesday.
The survey，published by the Bank of America, studied the rich with $3 million or more in assets.It found that “surprisingly few of those surveyed have well－developed plans to preserve and pass on their assets to their children”．
The majority of the 457 people surveyed are selfmade，first－generation rich.Fifty－two percent of parents have chosen not to tell their children just how wealthy they are，and 15 percent have given away nothing about the family wealth.One in three parents said they had never thought to do it.
They are worried that their children would become lazy，spend money freely，make bad decisions and even become a target for gold diggers.
