全面推行项目管理，首先要选好项目经理。项目经理应具备思维敏捷、实践经验丰富、工作认真

An analyst constructs a histogram and frequency polygon of monthly returns for aggressive equity funds over a 20-year period. Which of the following statements about a histogram or a frequency polygon is FALSE（）

A. Both a histogram and a frequency polygon provide a graphical display of data found in a frequency distribution on.

B. A frequency polygon is a bar chart of continuous data that have been grouped into a frequency distribution.

C. The height of each bar in a histogram represents the absolute frequency for each return interval.

在水平面内自由转动的小磁针，静止后总是一端指______，一端指______，这表明磁体具有______性，我国古代四大发明之一______就是依据这一原理制成的．

Tom is good at sports. He plays _______ basketball well, and he plays _______ piano Well, too. [ ]

A. the; the

B. /; /

C. /; the

D. the; /

下列诗歌中，哪一首属于乐府诗？（）

A、《湘夫人》

B、《孔雀东南飞》

C、《声声慢》

D、《关雎》

叙述者