What question can you never answer “yes”。
【谜底:Are you asleep】
What is the best thing to keep in hot weather?
【谜底:Cool】
What do you know about the kings of France?
【谜底:They are all dead】
What rises in the morning and waves all day?
【谜底:A flag】
I am the tallest animal in the world.What am I?
【谜底:a giraffe】