题目

THE SEVEN COMMANDMENTS（Mr. Jones, the owner of a farm, was one day driven out of the farm by all the animals he raised. The animals were excited to be free and independent. More important, they were masters of their own and, of course, their farm. Animals made seven rules of their own and Snowball painted them on the wall.）1. Whatever goes upon two legs is an enemy.2. Whatever goes upon four legs, or has wings, is a friend.3. No animal shall wear clothes.4. No animal shall sleep in a bed.5. No animal shall drink alcohol.6. No animal shall kill any other animal.7. All animals are equal.It w下列物质中冬天可用作融雪剂的是 [　　] A．蒸馏水 B．食盐 C．二氧化碳 D．氢氧化