化学上常用元素符号左下角的数字表示原子的质子数，左上角的数字表示原子的中子数与质子数之和，如表示核内有6个质子和7个中子的碳原子。下列关于和的说法中错误的是（）

下图是一个单细胞生物的结构示意图，通过观察我们可以判断该生物(　　)

①一定能进行光合作用　
②鞭毛的基部是线粒体分布较多的地方　
③一定是原核细胞　
④一定能进行细胞分裂

    Look! This is a picture. It is about Jenny's birthday. Her birthday is on May 25. On that day last year, she invited her friends to her house. Li Ming, Tom and I went to her house. We had a very good time. Before eating the birthday cake, we sang the birthday song for Jenny. She was very happy. And we were happy, too. After lunch, we went out to play in the park. We had fun all day.

下图中A，B，C，D四地位于同一纬度，其昼夜温差最小的是（    ）