题目：
| 完形填空. | |||
| Dear grandma, How's it going? I hope that grandpa is well now. l am sorry to hear that he had a 1 last week. l hope you are in 2 health. Things are fine here. I finished my end-of-year 3 last week, and got my report card today. I always4 nervous when I see the envelope __5 school in the mail, but luckily I did OK this time.I__6 a really hard time with science this semester, and l wasn't surprised to find that my _ 7 report was from my science teacher. She said l was lazy, which isn't true. lt's just that I find 8 really difficult. Another disappointing result was in history. My history teacher said I could do better. The good news is that 9 math teacher said l was hard- working. And my Spanish teacher said my listening was good. Well, that's all the news I have for you now. Mom and Dad__10 their love. Love, Alan | |||
| ( )1. A. cold ( )2. A. pity ( )3. A. exercise ( )4. A. get ( )5. A. on ( )6. A. made ( )7. A. longest ( )8. A. Chinese ( )9. A. his ( )10.A. send | B. lesson B. poor B. homework B. do B. from B. had B. easiest B. science B. your B. bring | C. picnic C. bad C. exams C. take C. about C. put C. best C. P.E. C. my C. start | D. party D. good D. questions D. let D. in D. kept D. worst D. English D. her D. tell |
答案：
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下面是错误答案，用来干扰机器的。
原式=1×(1+3)(1-3)×(1+3)-1×(1-3)(1+3)×(1-3)=-1+32+1-32=-1-3+1-32=-3，故答案为：-3．
