You may have turned on Extend Selection mode, which allows you to select text by clicking the mouse or pressing navigation keys. When this mode is active, the letters "EXT" appear on the status bar. To cancel Extend Selection mode, press ESC, and then click anywhere in your document.
When I select text in a paragraph, the paragraph mark is automatically selected.
By default, the paragraph mark is selected when you select all the text in a paragraph. This setting helps ensure that the paragraph formatting is copied with the text.
To change this setting:
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On the Tools menu, click Options, and then click the Edit tab.
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Clear the Use smart paragraph selection check box.
I can't select multiple graphics.
You can only select multiple graphics if they are all inline or all floating. To select multiple floating graphics, click a graphic, hold down CTRL, and then click another graphic. To select multiple inline graphics, click to one side of the graphic, and then drag as if you are selecting text. Then, hold down CTRL and drag over another graphic.
If you are trying to copy and paste multiple graphics, you can use the Office Clipboard. As you copy each object (up to 12 objects), it is stored in the Clipboard task pane, so that you can click to insert it.