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1、精选优质文档-倾情为你奉上7、食盐、白糖、碱面、味精的颗粒都是有规则几何外形的固体，人们把这样的固体物质叫做晶体。自然界中的大部分固体物质都是晶体或由晶体组成。缺点：不仅消耗大量电能，留下残余物，如果控制不好，还会产生有毒物质，造成二次污染。7、硫酸铜溶液与铁钉的反应属于化学反应。硫酸铜溶液的颜色是蓝色，将铁钉浸入硫酸铜溶液中，我们发现铁钉变红了。6、蚜虫是黄色的，在植物的嫩枝上吸食汁液，每个蚜虫只有针眼般大小，在10倍放大镜下我们可以看清它们的肢体。答：说明米饭不是甜的，但米饭含有淀粉，在我们咀嚼的过程中发生了变化，变得有甜味了。6、蚜虫是黄色的，在植物的嫩枝上吸食汁液，每个蚜虫只有针眼般大
2、小，在10倍放大镜下我们可以看清它们的肢体。9、在17世纪，人们发现把两个凸透镜组合起来明显提高了放大能力，这就是早期的显微镜。答：放大镜的中间厚，边缘薄，光线在透过放大镜时会产生折射，因此会把物图像放大。二、问答：答：烧饭时米变成了饭；写字时纸上留下了字迹；下雨后路上的积水慢慢地变成水蒸气消失在空中；岩石风化变成沙子等。2013人教版七年级下册英语各单元知识点大归纳Unit 1 Can you play the guitar? 短语归纳专心-专注-专业1. play chess 下国际象棋2. play the guitar 弹吉他3. speak English 说英语4. English
3、 club 英语俱乐部5. talk to 跟说6. play the violin 拉小提琴7. play the piano 弹钢琴8. play the drums 敲鼓9. make friends 结交朋友10. do kung fu 会（中国）功夫11. tell stories 讲故事12. play games 做游戏 13. on the weekend=on weekends （在）周末14. join the basketball club加入篮球俱乐部1. play +棋类/球类 下棋，打球2. play the +西洋乐器 弹/拉乐器3. be good at doi
4、ng sth.= do well in doing sth. 擅长做某事4. be good with sb. 善于与某人相处5. can + 动词原形 能/会做某事6. a little + 不可数名词 一点儿7. join the club 加入俱乐部8. like to do sth. =love to do sth. 喜欢/喜爱做某事9. say it in English 用英语说它10. show sth to sb = show sb sth “把某物给某人看11. English-speaking students 说英语的学生（带有连词符，有形容词性质）用法集萃1， 情态动词
5、+V原 can do= be able to do2， Play+ the+ 乐器 乐器类+the +球类，棋类3， join 参加社团、组织、团体 join sb in doing sth加入到某人中join sb for sth加入.做某事 非乐器类 4， 4个说的区别：say+内容 speak+语言 talk 谈论 talk about sth talk with sb talk to sb tell 告诉，讲述 tell sb （not）to do sth tell stories/ jokes讲笑话/故事5， want to do sth= would like +（sb）to do
6、 sth想做某事6， 4个“也”的区别：too 肯定句末 （前面加逗号） Either否定句末（前面加逗号） Also 行前be 后 As well 口语中（前面不加逗号）7， good be good at+ doing=do well in doing擅长于 be good for 对有益 （be bad for对有害） be good to 对友好 （good 可用friendly，nice，kind替换） be good with和相处好=get on/ along well with8， How/ what about+V-ing 怎么样？（表建议）9，感官动词（look, soun
7、d, taste, smell, feel）+adj/ like10，选择疑问句：回答不能直接用Yes或者No，要从中选择一个回答11，students wanted for school show（wanted表示招募，含有被动意义）12，show sth to sb=show sb sth give sth to sb=give sb sth13， help help sb （to）do sth帮助某人做某事help sb with sth帮助某人某事With sbs help= with the help of sbHelp oneself to 随便享用15，be busy doing
8、 sth/ be busy with sth16，need to do sth17，be free= have time18，have friends= make friends19，call sb at +电话号码20，on the weekend= on weekends21，English-speaking students 说英语的学生（带有连词符，有形容词性质）22，do kung fu表演功夫play the guitar /the violin/the drums/the pianoplayplay soccer/ basketball/volleyball/football/t
9、ennis/badminton （英式足球 / 篮球 / 排球 /英式足球，美式橄榄球/网球/羽毛球）14，busy : be busy doing sth/ be busy with sth忙着做某事15，need :need sb. to do sth. 需要某人做某事16，be free= have time 有时间17，have friends= make friends交朋友18，call call sb at +电话号码典句必背1. Can you draw? Yes, I can. / No, I cant.2. What club do you want to join? I
10、want to join the chess club.3. You can join the English club. 4. Sounds good./That sounds good. 5. I can speak English and I can also play soccer. 6. Please call Mrs. Miller at 555-3721. 话题写作Dear Sir, I want to join your organization (组织) to help kids with sports, music and English. My name is Mike.
11、 I am 15 years old. Im a student in No. 1 Middle school. I can play the guitar well. I can sing many songs. I can swim and speak English well, too. I think I can be good with the kids. I also do well in telling stories. I hope to get your letter soon. Yours, Mike Unit 2 What time do you go to school
12、? 短语归纳1. what time 几点 2. go to school 去上学 3. get up 起床4. take a shower 洗淋浴 5. brush teeth 刷牙 6. get to 到达 7. do homework 做家庭作业 8. go to work 去上班 9. go home 回家 10. eat breakfast 吃早饭 11. get dressed 穿上衣服12. get home 到家 13. eitheror 要么要么 14. go to bed 上床睡觉 15. in the morning/ afternoon/ evening 在上午/下午/
13、晚上16. take a walk 散步 17. lots of=a lot of 许多，大量18. radio station 广播电台19. at night 在晚上 20. be late for=arrive late for 迟到1. at + 具体时间点 在几点（几分） 2. eat breakfast/ lunch/dinner吃早饭/午饭/晚饭3. thirtyhalf past +基数词 点半 4. fifteena quarter to +基数词 差一刻到点5. take a/an +名词 从事活动6. from to 从到 7. need to do sth 需要做某事用
14、法集萃典句必背1. What time do you usually get up? I usually get up at six thirty.2. Thats a funny time for breakfast. 3. When do students usually eat dinner?They usually eat dinner at a quarter to seven in the evening.4. In the evening, I either watch TV or play computer games.5. At twelve, she eats lots o
15、f fruit and vegetables for lunch.6. She knows its not good for her, but it tastes good. 7. Here are your clothes. 话题写作主题：谈论日常作息习惯My School DayI am a student. I usually get up at seven, and I eat breakfast at seven thirty. Then I go to school at eight. School starts at eight thirty. I eat lunch at tw
16、elve. I go home at 17:00. I often eat dinner at 19:00 and then play the piano. I do my homework at 20:00. At 22:00, I go to bed.Unit 3 How do you get to school? 短语归纳1. get to school 到达学校 2. take the subway 乘地铁3. ride a bike 骑自行车 4. how far 多远 5. from home to school 从家到学校6. every day 每天7. take the bu
17、s 乘公共汽车 8. by bike 骑自行车 9. bus stop 公共汽车站 10. think of 认为 11. between and 在和之间12. one 11-year-old boy 一个11岁的男孩13. play with 和玩 14. come true 实现 15. have to 不得不用法集萃1. take to = go to by 乘去2. How do / does （sb）get to ? 是怎样到的？3. How far is it from to ? 从到有多远？4. It takes sb. some time to do sth. 做某事花费某人
18、多长时间。5. How long does it take to do sth.? 花费多长时间？6. It is + adj. + to do sth. 做某事是.7. Thanks for + n. / Ving 感谢你（做）某事。典句必背1. How do you get to school? I ride my bike.2. How far is it from your home to school?3. How long does it take you to get to school?4. For many students, it is easy to get to sch
19、ool.5. There is a very big river between their school and the village.话题写作主题：上学的交通方式 写作思路：开篇点题：点出自己的出行方式；具体内容：自己选择这种交通方式的原因；结束语: 表明自己的观点。The Best Way for Me to Go to SchoolDifferent students go to school in different ways in our school, but I llike to go to school on foot.First, I live near the scho
20、ol, so my home is not far from my school. And it takes me a few minutes to get there. Second, there is a crossing on my way to school, and sometimes the traffic is very busy. I think it is safer to go to school on foot. Third, I think walking is good for my health. Its a kind of sport and it makes m
21、e study better.So in my opinion, the best way to go to school is on foot. What about you?Unit 4 Dont eat in class.短语归纳1. on time 准时，按时 2. listen to 听3. in class 在课上 4. be late for 做迟到5. have to 不得不 6. be quiet 安静7. go out 外出 8. do the dishes 清洗餐具9. make breakfast 做早饭 10. make (ones) bed 铺床11. be noi
22、sy 吵闹 12. keep ones hair short 留短发13. play with sb. 和某人一起玩 14. play the piano 弹钢琴15. have fun 玩得高兴 16. make rules 制订规则用法集萃1. Dont + 动词原形+其他，不要做某事。 2. help sb. (to) do sth. 帮助某人做某事3. too many + 可数名词复数 太多的 4. practice doing sth. 练习做某事5. be strict with sb. 对某人要求严格 6. be strict in sth. 对某事要要求严格7. leave
23、sth sp. 把某物忘在某地8. keep + 宾语+形容词 使保持某种状态9. learn to do sth. 学会做某事 10. have to do sth. 不得不做某事典句必背1. Dont arrive late for class. 上课不要迟到。2. Can we bring music players to school? 我们可以带音乐播放器到学校吗？3. And we always have to wear the school uniform. 并且我们总是不得不穿校服。4. There are too many rules! 有太多的规则！5. Dont leav
24、e the dirty dishes in the kitchen! 不要把脏盘子留在厨房里！6. I have to keep my hair short. 我不得不留短发。话题写作Dear Tom,Thanks for your last letter. You want to know the rules in our school. Now let me tell you about them.We cant arrive late for class. We cant talk loudly in class. We should keep quiet. When we meet o
25、ur teachers on our way, we should say hello to them. We cant eat or drink in class, and we cant listen to music or play games in class.I think we have too many rules. What about yours? Please write and tell me.Yours,Li MingUnit 5 Why do you like pandas?短语归纳1. kind of 有几分，有点儿 2. be from / come from 来
26、自于3. South Africa 南非 4. all day 整天5. for a long time 很长时间 6. get lost 迷路7. places with food and water 有食物和水的地方8. cut down 砍倒 9. in (great) danger 处于（极大）危险之中 10. twelve years old 十二岁 11. things made of ivory 由象牙制成的东西用法集萃1. Why? 为什么？ Because 因为 2. let sb. do sth. 让某人做某事 3. want to do sth. 想要做某事 4. one
27、 of + 名词复数 之一 5. forget to do sth. 忘记要做某事 6. forget doing sth. 忘记做过某事 7. help sb. (to) do sth. 帮助某人做某事8. be friendly to sb. 对某人友好典句必背1. Why do you like pandas? 你为什么喜欢熊猫？Because theyre kind of interesting. 因为它们有点儿有趣。2. Why does John like koalas? 约翰为什么喜欢树袋熊？Because theyre very cute. 因为它们非常可爱。3. Why do
28、nt you like tigers? 你为什么不喜欢老虎？Because theyre really scary. 因为它们真的吓人。4. Where are lions from? 狮子来自哪里？Theyre from South Africa. 它们来自南非。5. Elephants can walk for a long time and never get lost. 大象能走很长时间并且从不迷路。6. They can also remember places with food and water. 它们也能记住有食物和水的地方。7. But elephants are in g
29、reat danger. 但是，大象处于极大危险之中。8. People cut down many trees so elephants are losing their homes.人们砍倒了许多树，因此，大象渐渐失去它们的家园。9. Today there are only about 3,000 elephants (over 100,000 before)现在仅有大约3000头大象（之前超过10万头大象）。10.Isnt she beautiful? 她难道不美丽吗？话题写作The Animal I LikeThere are many kinds of animals in the
30、 world. What animal do I like? Lets know her.Many people like her very much. I also like her. She is from China. She is very cute. She doesnt eat grass and meat at all. She eats bamboo every day. She is so nice. She is black white. She has two big black ears and eyes. And she also has black legs and
31、 arms.What animal is she? She is a panda. I like panda very much. Do you like her? What animal do you like?Unit 6 Im watching TV.短语归纳1. watch TV 看电视 2. read a newspaper 看报纸3. talk on the phone 通过电话交谈 4. listen to music 听音乐5. use the computer 使用电脑 6. make soup做汤7. wash the dishes 洗餐具 8. kind of 有点儿用法
32、集萃1. What + be+ 主语+ doing? 正在做什么？ 主语+ be + doing sth. 正在做某事。2. Id love / like to do sth. 我愿意做某事。3. any other + 可数名词单数 其他任何一个4. wish to do sth. 希望做某事典句必背1. Why are you doing? 你在做什么？Im watching TV. 我在看电视。2. Whats she doing? 她在做什么？Shes washing her clothes. 她在洗她的衣服。3. What are they doing? 他们在做什么？Theyre
33、listening to a CD. 他们在听一张CD 唱片。4. Are you doing your homework? 你在做你的家庭作业吗？Yes, I am. / No, Im not. Im cleaning my room. 是的，我在做。/ 不，我没有。我在打扫我的房间。5. Zhu Hui misses his family and wishes to have his moms delicious zongzi. 朱辉思念他的家人并希望吃上他妈妈的可口粽子。 话题写作Its seven oclock in the evening. Kates family are all
34、at home. Kate is doing her homework. Her father is reading a book. Her mother is watching TV. Her grandfather is listening to the radio and her grandmother is cleaning the room. Her sister, Betty, is playing computer games. They are all enjoying themselves.Unit 7 Its raining!短语归纳1. not bad 不错 2. at
35、the park 在公园3. take a message for 为捎个口信4. have a good time / have a great time / have fun / enjoy oneself 过得很愉快5. call sb. back 给某人回电话 6. no problem 没问题 7. right now 现在 8. talk on the phone 通过电话交谈 9. some of 当中的一些 10. by the pool 在游泳池边 11. drink orange juice 喝橙汁 12. study hard 努力学习 13. on a vacation
36、 在度假 14. in the mountains 在山里 15. call sb. 给某人打电话 16. write to sb. 给某人写信17. right for 适合 18. 给拍一张照片用法集萃1. tell sb. (not) to do sth. 告诉某人（不要）做某事2. have a great time/have fun + (in) doing sth. 愉快地做某事3. just right for doing sth. 做某事正合适典句必背1. Hows the weather? 天气怎么样？2. Its cloudy. / Its sunny. / Its rai
37、ning. 天气多云。/ 天气晴朗。/ 天正下雨。3. Hows it going? 情况怎么样？4. Great! / Not bad. / Terrible! 好极了！/ 不错。/ 糟糕！5. Can I take a message for him? 我给他捎个口信好吗？6. Im having a great time visiting my aunt in Canada. 我正在加拿大愉快地拜访我的姨妈7. My family and I are on a vacation in the mountains. 我和我的家人正在山里度假。8. Its hot in your count
38、ry now, isnt it? 现在你的国家天气炎热，不是吗？话题写作The Weather in BeijingHello, everyone! Im from Beijing. Do you want to know the weather in Beijing? Now let me tell you something about the weather here.In Beijing, spring is very short and warm. In summer, its very hot, but it often rains. We often go swimming in
39、 the river. In autumn, the weather is very dry and cool. We often go to the farm to work with the farmers to help them. In winter, its very cold, and sometimes its snowy and windy.I like swimming, so summer is my favorite season.Unit 8 Is there a post office near here?短语归纳1. post office 邮局 2. police
40、 station 警察局3. pay phone 付费电话 4. Bridge Street 桥街5. Center street 中心大街 6. Long Street 长街7. near here 附近 8. across from 在对面9. next to 挨着，靠近 10. between and 在和之间11. in front of 在前面 12. excuse me 劳驾13. far from 离远 14. go along 沿着走15. turn right / left 向右 / 左转 16. on the(或ones) right / left 在（某人的）右边 / 左
41、边 17. in my neighborhood 在我的街区 18. look like 看起来像 19. in life 一生中 20. be free 免费（有空）用法集萃1. Turn right / left at the +序数词+ crossing. 在第几个路口向右 / 左转 2. spend + 时间 / 金钱 + on sth. 花费时间/金钱在 spend + 时间 / +金钱 (in) doing sth. 花费时间/金钱做某事3. watch sb. doing 观看某人正在做某事4. enjoy doing sth. 喜欢做某事典句必背1. Is there a hospital near here? 这附近有医院吗？Yes, there is. Its on Bridge Street. 是的，有。它在桥街上。2. Oh wheres Center Street? 噢中心大街在哪里？Its not too far from here. 它离这儿不太远。3. Go along long Street and its on the right. 沿着长街走，它在右边。4. Turn right at the first crossing. 在第一个十字路口向右转。话题写作Where is the hotel?