Our programmers make sure that each learner has encountered a new word before he or she is tested on it. It tends to be the case that the human memory is a little less fallible than our programs. Also, "Getränke" has a dictionary hint. Note that if you are in the "test out" mode, you cannot peek.
Seems to me approximately 0% of English speakers talk about beverages - they talk about drinks and Duolingo should see that "you are drinking drinks" is EXACTLY what this sentence means.