What can be used as a slide background?
Patterns, pictures and textures can be used as slide backgrounds.
Open PowerPoint2010, select the slide you want to set the background, right-click on the slide, and then select "Format Background"
It will pop up after clicking dialog box, select "Picture or textual fill", and then click "File" below
to open the Insert Picture dialog box, select the picture you want to insert
A dialog box will pop up. If you only insert the image into one slide, select Close. If you insert the image into multiple slides, select Apply to All
The final effect is as shown in the picture
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