已知数列$\left\{a_n\right\}$的通项公式为$a_n={\log }_2\frac{3+n^2}{4}$，那么$\mathrm{l}{\mathrm{og}}_{2}3$是这个数列的(     )

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中选出最佳选项，并在答题卡上将该项涂黑。

        The world always makes way for the dreamer

        When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler 1everyone’s spirits up to the ceiling(天花板). I 2 there feeling like I could do anything. When we got to the car, I turned to my father and said, “Dad, I want to 3people feel like that.” My father asked me 4I meant. “I want to be a motivational（激励人的）speaker just like Mr. Zigler,” I replied. A（An）5was born.

        Recently, I began seeking my dream of motivating others.6a four-year relationship with Fortune 100 Company 7as a sales-trainer and ending as a regional(地区的) sales manager, I left the company at the height of my 8.  Many people were9that I would leave after earning a six-figure（六位数） income. And they wondered 10would risk everything for a dream.

        I made my11to start my own company and leave my enviable position after 12 regional sales meeting. The vice-president of our company made a 13that changed my life. He asked us, “If a god would offer you three wishes, what would they be?” After giving us a(an)14to write down the three wishes, he then asked us, “Why do you need a 15?” I would never forget the power I felt at that moment. I realized that 16I had achieved in the past had prepared me for this moment. I was ready and didn’t need a god’s help to become a motivational speaker. A motivational speaker was17 .

        Having made that decision, I was immediately 18. One week after I gave notice, my husband lost his job, and now we had no 19. But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better job. And I was able to book several20ngagements（约定）with new customers. I discovered the unbelievable power of dreams.

与6899相邻的两个数是____和____。