How come people seem to know all these other words which we haven't learned at this level yet? And why are the exercises so random? There's no way to learn the difference between singular and plural for the same words as these are in completely different test sets and you forget what the singular was. Same goes for i have xxc,you have xxx,he has xxx etc it would be better to learn the verb with all different options at the same time.
It does not sound like a 'k' to me at all, montignard. Are you relatively new to the course? I know it took me some time to get used to the computerised voice, and for those words that I'm really iffy about, I generally go to Forvo.com instead. You can look up most words in whatever language you need there, and I highly recommend it as an addition to Duo's speakerbot.
Your question is unclear, David. If you are saying the intonation of the computerised voice implies a statement rather than a question, and that it is unclear to you how the answer, then, can be a question indeed, then all I can say is 'Duo's computerised voice is pretty terrible at intonation'.