Narrator read selected text
Narrator has an hotkey to 'Read previous line'. It should also have a hotkey for 'Read the selected text'.
Thanks for sharing this with us. If you press the Narrator Key (either Caps Lock or Insert) + Shift + the Down Arrow you can read the selected text.
You can also customize the key you want to use as the Narrator Key in Narrator settings. For more information on Narrator check out the Narrator guide here https://support.microsoft.com/en-us/help/22798/windows-10-complete-guide-to-narrator