八年级(初二)：语文　 数学　 英语　 物理　 生物　 历史　 道法　 地理　

八年级(初二)试题

如图，AD是△ABC中∠BAC的角平分线，DE⊥AB于点E，S_△ABC＝7，DE＝2，AB＝4，则AC长是（）

图片_x0020_100009

A . 3 B . 4 C . 6 D . 5

重点词汇

（1） strange(名词)陌生人
（2） steal(过去式)；(过去分词)偷；窃取
（3） lay(过去式)；(过去分词)放置；产卵
（4） tradition(形容词)传统的
（5） tie(过去式)；(过去分词)；(现在分词)v.捆；束

中国共产党在探索建设社会主义道路过程中曾经形成过一些错误理论观点、政策思想和实践经验，这些错误对当时的社会造成很大影响，以下表现属于其中的是（）

①大跃进 ②人民公社化运动 ③文化大革命 ④“两个凡是”思想 ⑤对外开放 ⑥农业生产合作化

A . ①②③⑤⑥ B . ①②③⑥ C . ①②③④⑥ D . ①②③④

如图，在5×5的方格纸中，点A，B均在格点上，请按要求画图.①仅用无刻度直尺，且不能用直尺中的直角：②保留作图痕迹.

（1）在图1中过点B画线段AB的垂线l；
（2）在图2画一个面积为2的格点 $\text{[math]}$ ABC.

如图是探究平面镜成像特点的实验装置，M为玻璃板，A和B是两支完全相同的蜡烛，图乙是在做实验时留下的记录痕迹，下列说法正确的是（）

A . 实验过程中，玻璃板M应与水平桌面垂直放置 B . 实验中选择玻璃板代替平面镜是为了能成更清晰的像 C . 实验过程中，要测多组实验数据是为了减小实验误差 D . 选择完全相同的A，B两支蜡烛是为了验证像距和物距是否相等

将下列各民族与其对应的节日对号入座

回族 a 泼水节

傣族 b 开斋节

藏族 c 那达慕大会

蒙古族 d 雪顿节

对于实数a、b，定义一种新运算“⊗”为：a⊗b= $\text{[math]}$ ，这里等式右边是通常的四则运算．请解方程（﹣2）⊗x=1⊗x．

到1957年底，我国政府编制的第一个五年计划各项指标都大幅度超额完成，特别是工业和交通运输业喜报频传。其中从湖北传出的工业和交通领域的喜报是（）

A . 武汉钢铁集团公司建成投产 B . 武汉长江大桥建成 C . 中国试制成功第一架喷气式飞机 D . 汉阳钢铁厂建成投产

正比例函数y=﹣3x的图象经过坐标系的（　　）

A . 第一、二象限 B . 第一、三象限 C . 第一、四象限 D . 第二、四象限

一张圆心角为45°的扇形纸板和圆形纸板按如图方式各剪得一个正方形，边长都为1，求扁形纸板和圆形纸板的面积比．

Boys, don't lose________ in playing Angry birds. It is bad for your eyes to play computer games for a long time.

A . himself B . yourself C . themselves D . yourselves

阅读短文，下列问题

Many people go to school for an education. They learn languages, history, politics, geography, physics, chemistry and mathematics. Others go to school to learn a skill so that theycan make a living.

School education is very important and useful. Yet, no one can learn everything from school. A teacher, no matter how much he knows, cannot teach his students everything they want to know. The teacher's job is to show his students how to learn. He teaches them how to read and how to think. So, much more is to be learned outside school by the students themselves.

It is always more important to know how to study by oneself than to memorize some facts or a formula（公式）. It is actually quite easy to learn a certain fact in history or a formula in math. But it is very difficult to use a formula in working out a math problem.

Great scientists before us didn't get everything from school. Their teachers only showed them the way. Edison didn't even finish primary school. But they were all so successful. They invented so many things for mankind. The reason for their success is that they knew how to study. They read books that were not taught at school. They would ask many questions as they read. They did thousands of experiments. They worked hard all their lives, wasting not a single moment. Above all, they knew how to use their brain.

（1） People go to school to _________.

A . learn several subjects B . make a living C . get an education D . learn from teachers
（2） According to the passage, the most important thing a teacher should do is _________.

A . to teacher his students everything he knows B . to teach the students how to think C . to know everything they want to know D . to teach the students how to work out a math problem
（3） To work out a math problem, you need to know _________.

A . only a certain formula B . a certain fact C . some facts D . the way to solve it
（4） Why were many scientists so successful?

A . They received good education. B . They were very clever. C . They knew how to learn. D . They learned lots of facts and for mulas.
（5） How did great scientists study?

A . They read a lot of books and asked many questions while reading. B . They did thousands of experiments. C . They always worked hard and never wasted time. D . All of the above.

等腰三角形有一个外角为110°，它的顶角为

小明在学习过程中，遇到这样一个问题：如图1，在菱形 $\text{[math]}$ 中，点M，N分别是边 $\text{[math]}$ ， $\text{[math]}$ 的中点，点P是对角线 $\text{[math]}$ 上的动点，连接 $\text{[math]}$ ， $\text{[math]}$ ， $\text{[math]}$ ，当 $\text{[math]}$ 是等腰三角形时，求线段 $\text{[math]}$ 的长度.小明根据学习函数的经验，对此问题进行了以下探究，请补充完整.