小练笔。

如果你去北京旅游，你打算给你的家人买些什么礼物呢？请写一写。

      I want to buy a dress for my mother, I want to buy __________________________________

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关于大版照相的照片总放大倍率描述，正确的是（）

A.照片总放大倍率=物镜放大倍率×照相目镜放大倍率×1.5

B.照片总放大倍率=物镜放大倍率×照相目镜放大倍率×2

C.照片总放大倍率=物镜放大倍率×照相目镜放大倍率×2.5

D.照片总放大倍率=物镜放大倍率×照相目镜放大倍率×3

E.照片总放大倍率=物镜放大倍率×照相目镜放大倍率×5