设 $S_n$ 为数列 $\left\{a_n\right\}$ 的前 $n$ 项和，且 $S_n=2a_n-n+1\left(n\in N^{*}\right),b_n=a_n+1$ ．

一元二次方程 的一般形式是____．

有理数a,b在数轴上对应位置如图所示，则a+b的值为（   ）

① How does Amy feel? ____     A. I went swimming．

② What did you do last weekend? ____     B. He is a teacher．

③ Where does John come from? ____     C. He comes from the USA．

④ What's your father's job? ____     D. We have English and music．

⑤ What do you have on Mondays? ____     E. She is tired．

⑥ What is the tiger doing? ____     F. Please hold on．

⑦What will you do for your mum? ____     G. At 7: 00 a．m．

⑧Whose dog is it? ____     H. I'll cook noodles for her．

⑨Can I speak to your mum，please? ____     I. It's walking．

⑩When do you do morning exercises? ____     J. It's hers．

乙河干流流向大致是（　　）