I don't have Adobe Acrobat Reader, but I do have Adobe Professional 6.0. I also have Graphic Converter 4.9 (it's a ≈$40 shareware that is pretty robust for a piece of ≈$40 software).
Using the "Select image" tool in Acrobat, I copied the selected area to the clipboard. Then, I opened Graphic Converter and under File, did New > Image Using Clipboard (shortcut keyboard command ⌘j). Then I did a "Save As" to a jpeg file type (default name "From Clipboard.jpg").
The jpeg image should drag as an attachment in Mail with no problem at that point.
I also have Microsoft Word 2004. If you are working on a school paper using Word, you should also be able to do the following:
In Word, I did an "Insert > Picture > from File," and the jpeg picture file inserted as an "in-line" picture (black squares at corners, in-line with text), as opposed to a "floating image" (white squares at corners, and that floats above the text).
Maybe one of these two work-around procedures will work out for you.
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