1、本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/1英语：Plants and animals, including humans, need food and water to live on. These are from the natural resources(资源) on Earth. To protect these resources, we need to keep the air clean and the water d
2、rinkable. We need to keep the soil (土壤)healthy. How do we do that?Protect the landThe soil that covers fields and farms provides much of the food we eat. Human activities such as plowing(耕) fields, mining(采矿), and building highways can destroy (破坏)the land. Erosion happen when wind and water carry a
3、way the soil. Soil erosion can turn rich farmland into a desert wasteland. So does this mean we shouldnt build a highway or plow a field? Of course not. But it does mean we might think about Earthfriendly ways of doing those things.Today farmers plow their fields in different ways to prevent erosion
4、. They try to use less water for their crops. They keep animals from eating the growing grass in just one area. Farmers also plant trees to prevent erosion from happening.Save the TreesAnother human activity that damages the land is deforestation(采伐森林). People take away a large number of trees from
5、a forest. Millions of square kilometers of forest disappear each year. When this happens, many plants and animals lose their places to live. They may die out, or become very few. Scientists havent even discovered all the living things in the forest. We may be losing some without even knowing they ar
6、e there. Trees absorb (吸收)and use carbon dioxide (二氧化碳)when they make food. Environmentalists encourage careful management of the forests. They ask people to replant trees after they cut down the forest. Recycle, Reuse, ReducePeople throw a piece of paper into the wastebasket after using it. The pap
7、er becomes trash. Where does the trash go next? Much of our trash ends up in landfills(垃圾填埋地). They take up valuable land and sometimes pollute the water, air, and land around them. More than a third of the trash in landfills is paper. Recycling, reusing, and reducing what you throw away can cut dow
8、n on the need for more landfills. In fact, we can recycle about eighty percent of household trash.( )1. What does the underlined word erosion mean?A. Plowing fields and mining本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/2B. Cutting down trees
9、and farming.C. Wind and rain carrying away soil. D. Building highways on the farmland.( )2. Why do we need to save the trees?A. To discover more new trees every year.B. To encourage careful management of the forest.C. To take away a large number of trees from the forest.D. To keep good places for an
10、imals and plants to live in.( )3. How much of the trash can we recycle?A. All the trash. B. Very little. C. One third.D. Four fifths.根据对话内容，用方框中所给词 的适当形式填空。teach, student, invent, himself, at, job, importance, knowSchool education is very important and useful. Yet no one can learn everything at scho
11、ol and a teacher cannot teach his 1 everything they want to know.His 2 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 3 .It is always more 4 to know how to study by oneself. It is quite easy to learn so
12、mething, but it is difficult to use it to solve problems. Great inventors do not get everything 5 school, but they still can 6 many things and change the world a lot.How can the inventors do all of this? One of the answers is: they 7 how to study. A lot of things are not taught in the classroom. The
13、y get a lot of knowledge by reading outside school. They work hard and never give up all their lives.科学：1.(2010 年 桂林市 30.6 分) A、B、C、D、E 是初中化学中的五种常 见物质。 C、D 是单质，C 为紫红色固体， D 被认为是最清洁的能源。B 的浓溶液常用做干燥剂。已知 Fe 和 A、B 的水溶液分别能发生反应：Fe + A C + E； Fe + B D + E 。（1）写出 A、B、C 的化学式： A ， B ，C 。本文由 百度文库批量上传下载工具 生成Creat
14、ed By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/3（2）现有 Fe 和 A、C 三种固体 组成的混合物，小 刚想测定该 混合物中 C 物质的质量分数，他设计并完成了以下实验：你认为，小刚的实验数据处理是否正确（填“正确”或“ 不正确”） ，理由是 。2.（2010 年 乌鲁木齐市 179 分）物质发生化学变化的前后，总质量是否发生改变？是增加、减小还是不变呢？甲、乙、丙三位同学按下面的步骤进行探究：（1）提出假设：物质发生化学变化前后总质量不变。（2）设计并进行实验，甲设计的 实验装置和
15、选用药品如图 A 所示，乙设计的实验装置和选用药品如图 B 所示，他们在反应前后都进行了规范的操作，准确的称量和细致的观察。写出 A、B 两个实验发生反应 的化学方程式： ， 。丙进行了图 C 所示的实验，在一根用细铜丝吊着的长玻璃棒两端，分别绕上粗铜丝，并使玻璃保持水平。然后，用酒精灯给 a 端铜丝加热数分钟。停止加热后冷却，他观察到的现象是 ， 。（3）实验结论：甲认为：在化学反应中，生成物的 总质量与反应物的总质量相等；乙、丙认为：在化学反应中，生成物的总质量与反应物的总质 量不相等。（4）你认为 的结论正确，请从原子的角度分析， 结论 正确的理由是： 。（5）导致其他实验结论错误的原因
16、是 ， 。因此，如果 的反 应，则一定要设计反应在密闭装置中进行。本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/4数学：（2009瑞安中考模拟第 24 题）如图甲，直角梯形 ABCD 中，AD BC，BAD=B=90，AD=AB=6cm，BC=8cm点 E 从点 A 出发沿 AD 方向以 1 厘米/秒的速度向终点 D 运动；点F 从点 C 出发沿 CA 方向以 2 厘米/ 秒的速度向终点 A 运动 当点 E、F 中有一点运动到终点时，另一
17、点也随之停止设运动的时间为 t 秒（1）当 t 为何值时，AEF 和ACD 相似？（2）连接 BF，随着点 E、F 的运动，四 边形 ABFE 可能是直角梯形若可能，请求出 t 的值；若不能，请说明理由？（3）当 t 为何值时，AFE 的面积最小，最小值是多少？本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/5英语：阅读：1. C 2. D 3. D 词汇：1. students 2. job 3. themselves 4. import
18、ant 5. at 6. invent 7. know科学：1.（1）CuSO4 H2SO4 Cu （2）不正确 4.2g 紫红色固体中包含有铁和硫酸铜反应生成的铜（铁和硫酸铜反应生成了铜 或 4.2g 紫红色固体不只是原来的 C 物质 或 4.2g紫红色固体的质量大于原来 C 物质的质量。其它合理答案均可。没有文字说明不给分）2.（2）BaCl2 Na2SO4BaSO 42NaCl Na2CO32HCl2NaClH 2OCO 2a 端上 铜丝变 黑 玻璃棒 a 端下沉（4）甲 在化学反应中，反 应前后原子的种类没有改 变，数目没有增减，原子的 质量也没有改变（5）B实验反 应后生成的气体逸散到空气中去了 C实验 a 端铜丝增加了氧元素的质量 有气体参与反 应或者生成物中有气体数学：本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411本文由 百度文库批量上传下载工具 生成Created By Yelky QQ:283830411http:/6
