There were many types of audio novels, and the audio novels that fell in love with single mothers might include: 1. Romance novels: The love story of the hero and heroine may involve marriage, love, family and other topics. 2. Horror novels: Telling all kinds of horror stories such as ghosts, evil spirits, monsters, etc. 3. Science fiction novels: about future technology, time travel, aliens and other topics. 4. Fantasy novels: about magic, mythology, and other topics. 5. Wuxia novels: stories about Wuxia characters, such as master showdowns, martial arts grudges, etc. The above are just some possible categories. The specific type of audio novel still needs to be decided according to the specific theme and style.