题目

People use their mouths for many things. They eat, talk, shout and sing. They smile and they kiss. In the English language, there are many meanings using the word “mouth”. But some of them are not so nice. For example, if you say bad things about a person, the person might protest (抗议) and say “Do not bad mouth me.” Sometimes, people say something to a friend or family member that they later regret(后悔) because it hurts that person’s feelings. Or they tell the person something they were not supposed to tell. The speaker might say, “I really put my foot in my mouth thi下列物质中一定与苯酚互为同系物的是（　　） A、B、C、D、C7H8O