On some of them, you can tap the word to see the meaning. Whenever its a new word at the beginning of a topic, it will be highlighted to that you know you can tap it.
Have to agree with Anthony, the way it is presented it is a guessing game. No hovering options explanation or sound. I generally have a better experience with Duolingo.
No sounds! Guessing games b.s.! Font too small for anyone to read. Luisito dropped the ball on this. Hey call me! Yes, you! 505 804.9594 It started out great. Readable fonts, now THIS! No sound on testing portions? This is worse than the lame Navajo course they brought out half baked with no sound or audio at all. How can anyone learn Navajo without sounds? Yes, they did that and NPR praised them for it. Made them look like fools. i know you will delete this, but Duolingo continually looks terrible when they bring out half baked, incomplete courses.