Imagine a rectangle that encloses only the objects you want to select.
Click at one corner of the rectangle and, while continuing to press the mouse button, drag until you have enclosed all the objects.
Release the mouse button.
All the valid objects inside or crossing the rectangle are highlighted.
Click mouse button 2 to indicate that you have finished selecting objects.
Sometimes it is convenient to use a combination of the ShiftClick and drag-select selection techniques. For more information, see Combining selection techniques.