You can select multiple model elements using a selection box. By default, selection boxes see and select entire solids.
If you press the CTRL key ONCE while the selection box is active, you will only see faces. The tooltip at the bottom of the screen shows these different modes. The CTRL key cycles between these modes. If you press CTRL once more, you will only see edges.
Draw a selection box from left to right, it will display in blue. Blue selection boxes will only see elements that are completely inside the box. Draw a selection box from right to left, it will display in green. Green selection boxes will see all elements that lie inside the box, AND all elements that cross the boundaries of the box.