A perplexing speech or text;a riddle.
It's as vexing as the riddle of the sphinx
a difficult puzzle.
A difficult puzzle
Riddle my riddle.
Propound a theory [question, riddle]
Solve a riddle
-- Who can answer a riddle?
He has found out the puzzle.
1、What is wind?
【谜底：Air in a hurry】
2、What's a skeleton?
【谜底：It's a lot of bones without the person on them!】
3、Which letter is a drink?
4、What table is in the field?
5、Which letter is an animal?
6、What is an astronomer?
【谜底：A nigh watchman with a college education.】
7、Which letter is a question?
8、What always travels on foot?
9、What has teeth but cannot eat?
10、What kind of dog never bite?
【谜底：A hot dog】
11、Where can milk be best stored?
【谜底：In a cow】
12、Which letter is around an island?
13、What is dark but made by light?
14、Which letter is a part of your face?
15、What wears a cap but has no head?
16、How many letters are in the alphabet?
17、What is never used until it's broken?
18、Which letter is a kind of vegetable?
19、What is the biggest ant in the world?
20、What is in the middle of the world?
【谜底：the letter “r”】
21、Where can happiness always be found?
【谜底：In the dictionary】
22、What comes after the letter “A”？
【谜底：All the other letters】
23、What makes the Tower of Pisa lean?
【谜底：It never eats.】
24、How many sides does a house have?
【谜底：Two-inside and outside.】
25、What is the smallest room in the world?
26、Why don't you advertise for your lost dog?
【谜底：He can't read.】
27、What is smaller than an insect's mouth?
【谜底：Anything it eats.】
28、When do you go as fast as a racing car?
【谜底：When you are in it.】
29、What do workers do in a clock factory?
【谜底：They make faces all day.】
30、What can you break with only one word?
31、What question can you never answer “yes”。
【谜底：Are you asleep】
32、What is the best thing to keep in hot weather?
33、What do you know about the kings of France?
【谜底：They are all dead】
34、What rises in the morning and waves all day?
35、I am the tallest animal in the world.What am I?
36、What word can you make shorter by adding to it?
37、How many great men have been born in London?
【谜底：None. Only babies.】
38、Why is it useless to send a letter to Washington?
【谜底：Because he's dead.】
39、What's the hardest thing about learning skating?
40、What person does every man take his hat off to?
41、What is higher without a head than with a head?
42、I fly, but I have no wings.I cry, but I have no eyes.
43、What can you swallow that can also swallow you?
44、What goes around the world but stays in a corner?
45、What starts with a T, ends with a T, and is full of T?
46、The greater it is, the less it can be seen. What is it?
47、What do you call your father's father's only son?
48、What two words have thousands of letters in them?
49、What large instrument do you carry in your ears?
【谜底：Drums, that is eardrums.】
50、On which side does a bird have the most feathers?