八年级数学试题参考答案
一.选择题（共36分，每题3分） BDAAD CBABC DA
二.填空题（共18分，每题3分）
13.0 14.一三四 （0，-5） 15.2 2 16.40° 17. 12 18. （-1，0） 三.解答题（共46分）
19.（3分）：2????????????????????????3分 20.每题3分，共6分：（1）x>5 数轴略??????????????3分
（2）??????????????????????????3分
21.（4分）以下仅供阅卷教师参考．
∵∠B=46°，∠C=54°∴∠BAC=80°????????????????1分 又∵AD平分∠BAC ∴∠BAD=∠CAD=40°????????????3分 又∵DE∥AB ∴∠ADE=∠BAD=40°????????????????4分 22.（4分）∵∠BED=∠CFD=90°，∠BDE=∠CDF，BD=CD
∴△BED≌△CFD ????????????2分 ∴DE=DF ????????????3分 又∵DE⊥AB，DF⊥AC
∴点D在∠BAC的平分线上 ????????????4分 23.（5分）分数视学生答题情况而定． 计算过程应有两种情况比较接近，如图中，（1）
AB=529 cm????????????3分；
（2）AB=25cm??????????????4分 ∴最短路径为25cm. ????????5分 24.(5分)设共有x人，则有4x+37棵树，由题意得：
??????????????????????2分
解之得：20 ????????????????3分 21 ∴x=21 ∴4x+37=121 （棵） ????????????????4分 答：这批树苗共有121棵. ??????????????5分 25.（6分）（1）2分，错一空扣0.5分 甲班 乙班 优秀率 60% 40% 中位数 100 98 方差 46.8 114 （2）选择甲班，理由略． ????????????????4分 （3）选择乙班，理由略． ????????????????6分 26. （6分）此题无论选择什么作为题设，什么作为结论，它有一个相同点--都是通过证明△ABD≌△ACE，然后利用全等三角形的性质解决问题． 【解析】 解法一：如果AB=AC，AD=AE，BD=CE，那么∠1=∠2． 已知：在△ABD和△ACE中，AB=AC，AD=AE，BD=CE，??2分 求证：∠1=∠2．??????????????????????3分 证明：∵AB=AC，AD=AE，BD=CE， ∴△ABD≌△ACE，??????????????????????5分 ∴∠BAD=∠CAE， ∴∠1=∠2．??????????????????????????6分 解法二：如果AB=AC，AD=AE，∠1=∠2，那么BD=CE． 已知：在△ABD和△ACE中，AB=AC，AD=AE，∠1=∠2，??2分 求证：BD=CE．??????????????????????3分 证明：∵∠1=∠2 ∴∠BAD=∠CAE，而AB=AC，AD=AE， ∴△ABD≌△ACE??????????????????????5分 ∴BD=CE．??????????????????????????6分 （其他方法略） 27. （7分） 解：（1）根据题意，点A的横坐标为3，代入直线l1：y?4x中，得点A的纵坐标为4，即点A322 （3，4）；即OA=5，又|OA|= 1|OB|．即OB=10，且点B位于y轴上，即得 214，b=﹣10；即直线l2的解析B（0，﹣10）； ??????????????????????????2分 将A、B两点坐标代入直线l2中，得4=3k+b；﹣10=b；解之得，k=3式为y= 143x﹣10； ????????????????3分 （2）根据题意，平移后的直线ly?43(x?3)?41的直线方程为3x?4；??4分 即点C的坐标为（0，4）；?????????????????????5分 联立线l212的直线方程，解得x=5，y=285， 即点D（ 215，285）； ????????????6分 又点B（0，﹣10），如图所示：故△BCD的面积S=1212?5?14?1475． ??????????7分 2014—2015 学年第一学期期末考试八年级英语试题 注意事项： 23 1、本试题分为第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分。满分100分，考试时间90分钟。 2、第Ⅰ卷答案填在后面所设Ⅰ卷答题表格中。 第Ⅰ卷（选择题 共60分） Ⅰ. 根据括号内所给音标写出正确的单词。（每题1分，共5分） 1. Jim is very __________ /′t?l?nt?d/ in music, so he won in the singing competition. A. tired B. traditional C. talented D. talent 2. Can you give me some ____________/?d′va?s/? A. advice B. advise C. article D. activity 3. He never eats fruit, _____________/ ?:l′e?? /it is good for his health. A. almost B. although C. through D. though 4. When crossing the road, you must be very ____________/′ke?fl/. A. comfortable B. common C. careful D. helpful 5. Li Ming ________/′v?z?t?d / his grandparents last weekend. A. waited B. wrote C. surprised D. visited Ⅱ. 选择填空 从每题A、B、C、D四个选项中，选出一个最佳答案。（每题1分，25分） 6. ---Tony, What’s ___ matter with you? --- I have _____ toothache. A. a, the B. the, a C. /, the D. the, / 7. ---Did you do _______ interesting on your vacation? ---Yes, I did. I went to Hongkong and bought________ for my parents. A. something, anything B. anything, nothing C. everything, something D. anything, something 8. ---Where did Jenny go in the summer vacation? ---She went ____________. A. somewhere warm B. anywhere warm C. warm somewhere D. warm anywhere 9. She does well in English exams, but she ______understands English programs. A. always B. often C. hardly D. sometimes 10. The food I cook isn’t delicious, but I _________can look after myself. A. at least B. less than C. more than D. a few 24 11. --- I run _____than my brother, but he is ________than me. ---Yes, he always get better grades. A. faster, more outgoing B. higher, funnier C. taller, friendlier D. faster, more hardworking 12. The man looks very young. __________ he is already 70. www.21cnjy.com A. In fact B. First of all C. After all D. At first 13. ---When and where shall we meet? ---_________ A. What a pity! B. It’s up to you. C. Let’s go. D. What should I do. 14. What he said made everyone ____________. A. feel comfort B. sound comfortable C. feel comfortable D. look comfortably 15. Jim doesn’t like the talk shows at all. He can’t _______them. A. love B. stand C. mind D. understand 16. ---What do you ________these two books? ---Both of them are interesting. A. find out B. care about C. bring out D. think of 17. --- What is he going to do when he _______up? --- He is going to ______ a doctor. A. grow, be B. grow, being C. grows, be D. growing, being 18. ---How are you going to be __________? ---I’m going to study math hard. A. a singer B. a violinist C. a driver D. an engineer 19. ---Will there be more people in 100 years, do you think? ---____, I hope. A. No, there isn’t B. No, there aren’t C. No, there won’t D. No, they won’t. 20. Now the students have ______free time, because they should spend ______time doing their homework. A. fewer, a fewer B. less, less C. more, more D. less, more 25