One of the "voice" drill questions asks the question: これわにほんごでなんですか and the answer is: これわでんわです
I don't understand what either of these statements mean at all.
The drill question also has written: Listen to the following, look at the answer choices, and select the best possible answer.
The drill is from:
What Is This, In Japanese?
Practice a few verbs and how to ask what things are in Japanese.