Thank you. Anne and Garfied, both of the methods you mentioed worked. thanks
a lot.

"garfield-n-odie [MVP]" wrote:

Open the document, click on File | Save as, choose "Plain text"
in the "Files of type" box, and save to different filename. When
you save as a plain text file, Word will automatically strip out
all of the graphics, objects, and text formatting, leaving you
with just plain text.

quekou wrote:

The document is long. It's tiring and time comsuming to hold Ctrl and select
graphics and other objects one by one. I only want to keep plain text. There
has to be a way of selecting all objects other than text all at once, hasn't
it? Thank you for helping me out. Waiting for answer online...