A. backside　　　　B.back

我们来看看这两种说法有什么不同。

上图：Kirsty sent me a postcard of Michelangelo's David, with her address written on the backside.

上图：Kirsty sent me a postcard of Michelangelo's David, with her address written on the back.

backside是对人的屁股的不太正式的说法，比如要抱怨一个人很懒，可以说“He spends all day sitting on his backside.”

如果想说明信片或者照片的背面，那么用back就好啦。

所以答案就是B了。

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