Dear Kent Xiao,
Thank you for the detailed report. I examined your files and got to the following conclusions:
Problem 1. As a default setting of Trace & Reference texts and dimensions are hidden. If you open the Trace & Reference palette, you can set individually to show or hide any element type on the Trace. (see attached image)
Problem 2: When you merge a dwg to ArchiCAD, there are some options regarding the scale of the drawing. Take a look at the Drawing Unit section of this article:
When you have an already scaled drawing in AutoCAD's Paper Space what you want to merge into the Layout Book, the current scale on the floor plan will determine the scale of it on the floor plan view.
So before you merge your dwg drawing into the Layout Book, you need to set the same scale on the ArchiCAD floor plan view as it is in the AutoCAD Paper Space in order to get the right scale when you use the layout as a Trace. After the merging process Current Scale can be set back to the scale you want to work in: The trace scale will be correct.
Let me know if you have further questions.