Section D1 is a kind of sandwich made of a piece of meat inside a 2 bun. A lot of people in the world think hamburgers are 3 . Today, hamburgers are one of the most 4 foods in the world .The most famous hamburger should be the "Big Mac ". Every year, about550million Big Macs are 5 in the U .S.1 .A. Steak B Salad C .Hamburger2 .A. noodle B .bread C .pasta3 .A. delicious B .starving C .thirsty4 .A. starving B .popular C .deep -fried5 .A. diet B .brand C .sold