理财师通过优质的理财规划方案可以帮助客户实现高收益低风险甚至无风险的理财目标。（）
参考答案：错
"Not having returned home yet, _____", his father said to the police. [ ]
A. his mother got worried
B. his mother must be worried
C. I think he is missing
D. he must have got into some trouble.
描述事物的数据有绝对数据和相对数据之分。大气中氧气的含量属于相对数据，常会用______的形式表示。
A．密度 B．百分数 C．比重 D．指数
