题目

I’m Chinese and I do feel _____ Chinese language is ______ most beautiful language. What’s your opinion?    A. the; a        B.不填; the       C. the; 不填     D. 不填; a 答案：A17．数列{an}中，an=2n-1，Sn=a1+a2+…+an，则$\underset{lim}{x→∞}$$\frac{{a}_{n}^{2}}{{S}_{n}}$=4．