How to use un and une in this sentence and why beer is having une biere(a beer) ?
Duck → canard → is a masculine noun so the appropriate article is likewise - un. Bière (beer) is a feminine noun so the appropriate article is feminine - une.
Apparently, people here have much too refined a sense of taste. Otherwise, they'd have immediately realized that this exercise is all about "Howard the Duck".
A whole beer? I picture him, beer belly bulging, clutching his pint in a dark corner of the pub. Quack Glug!!