If you reload the page enough times you do get the other eventually, if you feel like hitting the button repeatedly until you do.... It actually sounds to me like "ne" (which again doesn't make sense), and also the "s" in "jeans" is very clearly pronounced, which I believe is wrong.
Nope, they aren't. "aimer" only means "to love" with people and pets. With things, like jeans, "to love" is "adorer", and "aimer" means just "like".
By the way, could you read the entire thread before posting? You'll often find that your question has already been asked and answered (sometimes multiple times), and frequently there is much other useful information besides. Then if something still isn't clear to you, you can ask a more specific question. :)
This business of switching back and forth between typing what you hear and translating it, as against limiting exercises to one or the other, is functionally, psychologically, and educationally malfeasant. Which makes it how much of this system is implemented, actually. You want to respond automatically, naturally: trip wire. The exercises beg all kinds of questions, thereby opening your mind to learning the answers: all kinds of trip wires. They like to say that making mistakes is a very effective way to learn. Perhaps. But to be tricked into them, or led to them by terrible voice quality or careless implementation, is to foment the frustration and anger that are utterly counterproductive to learning. To coin a phrase, when Duo is good it is very, very good, but when it is bad it is horrid. Presumably the little girl in the nursery rhyme would learn as she grew, but there is no sign of that in Duo. They may be 'learning from their millions of users the best way to teach,' but they are apparently none the more interested in implementing it.