下列各句中，没有语病的一项是（  ）

下列各数中：+6，﹣8.25，﹣0.4，$-\frac{2}{3}$，9，$\frac{7}{5}$，﹣28，负有理数有（　　）个．

20世纪以来，中华民族经历了伟大的三个三十年的探索与实践。在九十年的历史进程中，中国人民在1919，1949，1979和2009年谱写的历史乐章的主题分别是（    ）

根据短文内容，选择正确答案。
Hello, friends!
    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 900 students and 50 teachers in our school. It is a good school in Zhengzhou: I'm in Class 2 Grade 7. 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.
                                                              Yours,
                                                            Zhou Dan

正确抄写句子，注意标点符号。