"isthisaduck"这个问题通常是一种玩笑或者谜语。你可以用以下几种方式回答：
1. 直接回答：
"Yes, it is a duck."
"No, it's not a duck."
2. 幽默回答：
"Well, if it quacks like a duck and walks like a duck, then it's a duck!"
"Only if it's wearing a hat and holding a stick."
3. 反问：
"Is it a duck or is it a swan in disguise?"
"How can I tell? Show me a picture!"
4. 互动回答：
"Let's find out together! Take a picture and send it to me."
根据你的关系和对话的语境，你可以选择最合适的回答方式。
