Simple Ear Training Quiz #1 (C) Re Or Mi?

This is the first in another series of ear training quizzes that I'm designing to be quite simple for those who are having trouble with my other quizzes: This one stays in one key throughout (C) ... and there's only two possible answers Re or Mi.

I'm planning on making one of these simple one key, two answer quizzes for each pair of tones that are next to each other in the major scale (ie: Re & Mi ... Mi & Fa ... Fa & Sol ...) as I think these are the most commonly confused for each other.
Once you can do these simple versions easily, then you should probably try the version where the key changes with each answer.

As always; I'm looking for feedback and suggestions.