Gaokao Math Practice Question
7. (5 分) 已知 $\left\{a_{n}\right\}$ 是公差为 1 的等差数列, $S_{n}$ 为 $\left\{a_{n}\right\}$ 的前 $n$ 项和, 若 $S_{8}=4 S_{4}$, 则 $\mathrm{a}_{10}=(\quad)$
- A.$\frac{17}{2}$
- B.$\frac{19}{2}$
- C.10
- D.12
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