Pat and Kris are roommates. They spend most of their time studying (of course), but they leave some time for their favorite activities; making pizza and brewing root beer. Pat takes 4 hours to brew a gallon of root beer and 2 hours to make a pizza. Kris takes 6 hours to brew a gallon of root beer and 4 hours to make a pizza. Root beer (hours to make) Pizza (hours to make) Pat 4 2 Kris 6 4 Questions: ___第1空(填Pat或Kris)______ has absolute advantage in producing root beer. ___第2空 (填Pat或Kris) ______ has absolute advantage in producing pizza. For Pat, the opportunity cost of making a pizza is ___第3空(用分数表示,如1/3)______ gallon of root beer. For Kris, the opportunity cost of making a pizza is ___第4空 (用分数表示,如1/3)_ _____ gallon of root beer. Therefore, ___第5空 (填Pat或Kris) ______ has the comparative advantage in making pizza.