根据短文内容，选择正确答案。
B
    I'm Kate from the UK. I'm in the Chinese club in our school. I like Chinese and I think it's interesting. My Chinese is very good. I can tell and write stories in Chinese. My favorite writer (作家) is Mo Yan from China. Now let me tell you something about my favorite writer and his family.     Mo Yan's real (真的) name is Guan Moye. Mo Yan is his pen name. This year Mo is 57 years old. His birthday is on February 17th. Mo writes stories very well. He can also write with his left hand (左手). Mo has a daughter. Her name is Guan Xiaoxiao. The girl can also write stories but she can't write with her left hand.

正项数列{a_n}的前n项和为S_n，且2S_n=a_n²+a_n（n∈N^*），设c_n=（﹣1）ⁿ $\frac{2a_n+1}{2S_n}$ ，则数列{c_n}的前2017项的和为____．

能够鉴定溴乙烷中存在溴元素的实验操作是

□÷75=75……（  ），当余数最大时，被除数是5700，

下面语段有多处语病，任选两处修改。

①颜真卿、东方朔、董仲舒的故事，让德州这个城市充满了传统文化的色彩无比风富。②德州，也是一个与廉颇、晏婴、宋哲元、时传祥等名字密不可分的。③建筑独特的董子街、黑陶的工艺精致、科技领先的太阳谷、风光旖旎的长河公园，都是她靓丽的城市名片。