题目选项分析

In Britain, "pig" refers to any member of the class of domestic swine, but in the United States the term refers only to younger swine not yet ready for market and weighing less than 82 kilograms (180 pounds).

In Britain, "pig" refers to any member of the class of domestic swine, but the United States uses the term when referring only to younger swine not yet ready for market and weighing less than 82 kilograms (180 pounds).