Billy and Jilly are twins. They’re eleven years old. They go to the same school and they’re in the same class. They look like each other(彼此) in every way (方面). They look like each other, and they behave (行为)like each other. They talk (说话)like each other. Their poor teacher, Miss Jones, can’t tell(分辨)who is who. "How on earth(到底) does your mother know who’s who" She asks them. "That’s easy. "Billy says. "Yes. "Says Jilly. "We have different names.\ They don’t look like each other.