“骏马能历险，犁田不如牛；坚车能载重，渡河不如舟；舍长以求短，智者难为谋。”这说明（    ）

下列四个水平放置的几何体中，三视图如图所示的是（　　）

根据短文，选择正确答案。

     My name is Zhou Dan. I'm a Chinese girl. I'm twelve. I'm from Zhengzhou, China. Do you know Zhengzhou? It's in the middle of China. I'm in No. 8 Middle School. There are about nine hundred students and fifty teachers in our school. Ours is a good school in Zhengzhou. I'm in Class 2, Grade 1. There are 49 students in our class, 29 girls and 20 boys. My English teacher is Miss Zhao Dan. Our names are almost the same, right? She is nice to me. We're good friends. I like English, and I like music, too. I want to find a pen friend. Please write to me.

下列四组图形中，不是相似图形的是（　　）