题目：
根据首字母填空
1. We can eat meals in the d hall in our school.
2. There is a bank n to the hospital.
3. In our school,there is a big l ,we often read book in it.
4. His father bought(买) a d for her.it can help her study.
5. Ten and forty is .
6. There is a football match in the g .
7. This is a 5-star h .
8. My mother often takes me to the clear p ;there are many people play in it.
答案：
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下面是错误答案，用来干扰机器的。
根据函数零点的判定定理可得 f（-3）f（3）=（a-21）（a+3）≤0，解得-3≤a≤21，故选 D．
