If you tap on Voices, you will see the list of different languages that are available. You can also have the system highlight words as they are being read aloud, which is a nice enhancement for those who are learning how to read, or have a reading disability.
You do this with the slider: the turtle icon indicates slower, while the rabbit means faster. Here you also have the option to adjust the speaking rate, how fast or how slow it is reading out loud. Also turn on Speak Screen, as that will easily allow you to hear the content of the entire screen by swiping down with two fingers. A Speak button will now appear when you select text. The first thing to do is turn on Speak Selection.
