Which of the following words isn't part of the theme? Cat, Dog, Hamster, Rabbit, Telephone?:
This is a verification question from A language learner' forum because I attempted to log in with wrong password many times. I refleshed the webpage, and found other questeion that I could understand, so I am able to log in with right password I can remember finally.
But I am curious what the question is about. What does the theme refer to?