"A tomato is circular" Is that wrong? "Correct solutions: One tomato is circular." Seriously?
I could not hear the "est" when the simulator was pronouncing the sentence.
Maybe because you thought "tomate" was pronounced /to-mah-teh/. It is pronounced /to-maht/, and the /eh/ you heard at the end was the "est".
WOW!!! What an amazing discovery, Duolingo. I didn't know you did rocket science! :)
And yet people still had difficulty with the sentence. How would it have helped those students to have made the sentence obscure.