บทสนทนานี้ใช้ตอบคำถามข้อที่33-35     

 Looking to get off the map?  Mongolia is your answer. With the lowest population density of any sovereign nation in the world and an estimated 250 sunny days per year, the landlocked country is known as "The land of Blue Skies." Here, long stretches of road reveal vast empty spaces and an occasional nomadic herder, which still forms the basis of living for many of the less than 3 million native Mongolians.

     The people are justly proud of their heritage and history, having controlled an empire that once spread as far as Eastern Europe and China. Today, a tourist in Mongolia can spend time hiking, horseback riding, fishing, munching on mutton and drinking airag, the fermented mare's milk that is the national drink. The highlight of any trip to Mongolia will be the great outdoors and encounters with the hospitable locals who still care for it.

The phrase "munching on" mean ______ .