读谜语,写字母.It"s like a snake,but it has no head.It"s like an eg

读谜语,写字母.It"s like a snake,but it has no head.It"s like an egg,but it has a short tail.It"s a chair,but you can"t sit on it.It"s like a sprout,but it doesn"t grow in the soil.You will say it when you have questions.It has two big bodies.when you say it,it sounds like an insect.