填空,回答问题。A:Whatisit?（）

填空,回答问题。(U+A)],|

A: What is it? '^-i;w2`(U+A)],|

B: Where do you write on it?(U+A)],|

.M.e5K1X4I9b/L'v:I)z8\)^9?;L8N(U+A)],|

C: Where do you put the address?(U+A)],|

;{3v8^7R4D)D+},c)o.x(U+A)],|

D: Where do you put the stamp?(U+A)],|

3M*E3r.B;G(E(U+A)],|