七年级下册经典单句改错题
七年级下册经典单句改错题
1 ) The girl doesn’t like late for class.
2)Look at a sun. It’s fine today .
3)The air is nice and clean. It’s good for walk.
4)Everyone in China like eating dumplings on Spring Festival.
5)Could you buy any bananas for me
6)She’s going to help us in our lessons tomorrow .
7)The school isn’t far here. Let’s walk there .
8)Where is Mr. Smith come from He comes from America.
9)The woman ride a black bike is my sister.
10)Everyone of us has a ruler .
11)Today we are going to learn the twelvth lesson.
12)What about to go out for a walk
13)My father want to buy a new bikie for me .
14)The people here all are working hard. .
15)There are some bananas in the tree.
16)Our teachers are busy on every Saturday .
17)May I ask you any questions
18)How good he dances at the party !
19)Do you free this afternoon Let me see. I’m busy .
20)It’s time for us going to school.
21)You’d better don’t go there at once.
22)Mu st I do it No, you mustn’t .
23)One of the boys are in a blue sweater .
24)He often help me learn English ..
25)This computer is her . It isn’t mine .
26)Li Hong can say English very well.
27)There is a nurse over there. Let’s to g o and ask her.
28)Please tell them don’t to play there .
29)How many day are there in a year
30)Can he play guitar
31)She sister can play chess.
32)I want to join a art club .
33)He can swim good .
34)Lisa wants to join the music club ,a nd she can’t sing well .
35)What’s club do you want to join
36)He is very good at tell stories .
37)Let’s to get there .
38)Show your new book for me .
39)Can you sing and dance
40)She usually get to school late .
41)Mr White teaches our English .
42)He likes to talk and play games with they .
43)You needn’t to leave so early.
44)Did you watch TV in an hour last night
45)Thanks for help me with my English.
46)She is very young, and she knows a lot.
47)Class begins. Please stop to talk .
48)What makes you to think so
49)The baby is sleeping. Please to be quiet .
50)If a policeman say “stop” , you must stop your car .
51)There was a big rain last night .
52)I don’t like winter because it’s too much cold .
53)What a fine weather it is today !
54)It snowed heavy last winter .
55)The weather in Picture 1 is much colder in Picture 2 .
56)It’s too cold outside .You need wear warm clothes .
57)Watch TV too much is bad for your eyes.
58)Zhang Li doesn’t like live in the tall building.
59)Everyone are here , but Liu Ying is away .
60)There were a lot of bread on the table yesterday .
61)Two hundred dollars are a big number for me .
62)You must look after the old good.
63)The boy is very interesting in English .
64)People often do sports to keep health .
65)My father thinks I’m enough tall for the work .
66)Would you like any more tea No, thanks .
67)He never does his work as careful as Mary .
68)This pair of shoes are too small for me to wear .
69)Our teacher is strict to us , but we all like her .
70)She is taller than any other students in her class .
71)It was a such fine day that they went to the park .
72)I saw she on the street just now .
73)Help yourself to some fruit, children .
74)Will you tell our funny stories
75)Who’s books are these They are hers .
76)It’s much better to walk than ride a bike .
77)It’s about ten minutes walk from here to the museum .
78)The number of students in our school are 2,000.
A number of them are from the country .
79)Jeff looked at me in surprised .
80)I don’t know the answer . You’d better ask else someone.
81)What was happened to you yesterday
82)Today is September 10th . Happy Teachers Day .
83)How do you think of the book
84)I lent my book to him and returned it for me .
85)She spends much money to buy skirts every day .
86)The child has only three tooth in his mouth .
87)A friend of my is waiting for me at the gate .
88)There are a man and some children over there.
89)He has many money , so he is very rich .
90)Are these your apples No , these aren’t .
91)The old woman looked very worrying.
92)The teacher with the students are planting trees over there.
93)To across the street is dangerous for the kids.
94)The radio is too noise . Please turn it down.
95)We need a piece of paper to write with.
96)The magazines are so easy that the children can read they easily .
97)Do you think it is good to the animals to stay in cages
98)The children enjoyed themself at the party yesterday .
99)I, he and you have lots of work to do.
100)My mother cook dinner for us every day .
101)The girl that wear glasses is my classmate .
102)Who is the girl that standing under the tree
103)The noodles that I cooked yesterday was very delicious .
104)There is a lot of things you could do .
105)The question is so hard that a few people can work it out.
106)We often hear she sing the English song .
107)Last week we went to home by bike.
108)You’d better to go out now .
109)Was he always go to school on foot last year
110)Monday is the first day of the week .
111)He works in an university . He is a professor(教授）
112)There is the book on the desk .
113)--I want to know what they went there .--By air .
114)You’d better take a umbrella with you. It’s raining outside. 115)Please pass a cup of tea for me . I am very thirsty .
116)I sometimes play basketball at half an hour .
117)When he gets to home , he always does his homework first . 118)In the evening , she either watches TV or play computer games . 119)Then she always takes a shower and eat a good breakfast . 120)She knows it’s not good she , but it tastes good !
121)My parents are very health .They always take a walk after dinner .
122)You need to brush your teeth after eat to have good teeth .
123)Here is your clothes .Go and get dressed quickly .
124)How long does it take he to get to school
125)It’s about 20 kilometers far away .
126)--How long does it take you to get there --About 15 minutes walk .
127)Tell me where does he lives .
128)Mary wants to know what he think of the trip .
129)Could you tell me where is the library
130)The foreigner arrived at Shanghai on a sunny day .
131)Mother told me don’t to go swimming in th e river .
132)--What about to go out for a walk -- Good idea .
133)What noisy children ! Go and ask them to keep quite .
134)I find that interesting to play games with children .
135)Excuse me , is there interesting anything in today’s newspaper 136)Look ! Miss Wang is busy help her mother with housework . 137)I want to know who this question can answer .
138)--Could you pass me a book on the desk -- Sure ..
139)Miss Zhao is one of the popular teacher in our school . 140)He spends most of his free time to remember new words every day .
141)Do you know the girl what is watering the flowers in the garden
142)This book isn’t her . I think it’s his .
143)If she won’t come , I’ll go shopping alone .
144)Ann went to school on time because it rained heavily yesterday.
145)--How long will you finish your homework ,Linda -- In an hour . 146)The teacher asked me that I needed any help .
147)Why don’t you to ask the teacher for help
148)He puts the book on the desk and went away .
149)The price of the car is very cheap . I can afford it .
150)The more friends you have , the happy you will be .
151)The hotel in which we lived last year isn’t clean .
152)She often practice playing the violin at home .
153)The apples in the tree are big and red .
154)For they, it is easy to get to school .
155)There is not bridge between the two cities .
156)It is they dream to have a bridge .
157)Do you think his dream can comes true
158)Thank you for help us .
159)It take about 50 minutes to get there by bus .
160)He often arrive late for class .
161)Not run in the hallways .
162)Listen to he in class carefully .
163)Don’t late next time .
164)She is first to get to school .
165)What does he has to do every day
166)They have to quiet in the library .
167)Does he have to be quite in class
168)There are too many rule in the school .
169)Don’t noisy .The baby is sleeping .
170)They are having fun play football on the playground .
最新七年级下册数学易错题精选
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七年级下册数学经典易错题
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七年级数学下册知识点及典型试题
七年级数学下册知识点汇总 第五章 相交线与平行线 一、知识网络结构 二、 知识要点 1、在同一平面内，两 条直线的位置关系有 两 种： 相交 和 平行 ,垂直是相交的一种特殊情况。 2、在同一平面内，不相交的两条直线叫 平行线 。如果两条直线只有 一个 公共点，称这两条直线相交;如果两条直线 没有 公共点,称这两条直线平行。 3、两条直线相交所构成的四个角中，有 公共顶点 且有 一条公共边 ,另一条边互为反向延长线的两个角是邻补角。邻补角的性质: 邻补角互补 。 4、两条直线相交所构成的四个角中,一个角的两边分别是另一个角的两边的 反向延长线 ，这样的两个角互为 对顶角 。 5、两条直线相交所成的角中，如果有一个是 直角或90°时，称这两条直线互相垂直， 其中一条叫做另一条的垂线。 垂线的性质： 性质1：过一点有且只有一条直线与已知直线垂直。 性质2：连接直线外一点与直线上各点的所有线段中，垂线段最短。 点到直线的距离:直线外一点到这条直线的垂线段的长度叫点到直线的距离。 6、同位角、内错角、同旁内角基本特征： ①在两条直线(被截线）的 同一方 ，都在第三条直线(截线)的 同一侧 ,这样 ???? ? ?????? ??????????? ? ??? ?????? ?????????????????????????????平移 命题、定理 的两直线平行：平行于同一条直线性质角互补 ：两直线平行，同旁内性质相等：两直线平行，内错角性质相等：两直线平行，同位角性质平行线的性质的两直线平行 ：平行于同一条直线判定直线平行 ：同旁内角互补，两判定线平行 ：内错角相等，两直判定线平行 ：同位角相等，两直判定定义平行线的判定平行线，不相交的两条直线叫平行线：在同一平面内平行线及其判定内角同位角、内错角、同旁垂线 相交线相交线相交线与平行线 4321 4321____________________________:
初一下册数学经典易错题
初一下册数学经典易错题 一、填空题 1.一个数的平方等于它本身，这个数是;一个数的平方根等于它本身，这个数是;一个数的算术平方根等于它本身，这个数是;一个数的立方等于它本身，这个数是;一个数的立方根等于它本身，这个数是;一个数的倒数是它本身，这个数是;一个数的绝对值等于它本身，这个数是。 2.16的平方根为，，的平方根等于. 3.已知; ，则。 4.已知一个正数的两个平方根分别为3x-5和x-7，则这个正数为. 5. -1的整数部分为;小数部分为;绝对值为;相反数为. 6. 如图，在数轴上，1，的对应点是A、B，A是 线段BC的中点，则点C所表示的数是。 7.已知，OAOC，且AOB：AOC=2：3，则BOC的度数为。 8.如果1=80，2的两边分别与1的两边平行，那么2= 。 9.已知点A(1+m，2m+1)在x轴上，则点A坐标为。 10.已知AB∥x轴，A点的坐标为(3，2)，并且AB=5，则B的坐标为. 11.点P(a-2,2a+3)到两坐标轴距离相等,则a= . 12.将点A(1，-3)向右平移2个单位，再向下平移2个单位后得到点B(a， b)，则ab= .新课标第一网 13.已知平面直角坐标系内点P的坐标为(-1,3),如果将平面直角坐标系向左平移3个单位,再向下平移2个单位,那么平移后点P的坐标为________. 14.在平面直角坐标系中，已知A(2，-2)，在y轴上确定一点P，使△A OP为等腰三角形，则符合条件的点P共有个。 15.点P(a+5，a)不可能在第象限。 16.平面直角坐标系内有一点P(x，y)，满足，则点P在 17.方程在正整数范围内的解是_____ 。 18.已知x=1，y=﹣8是方程mx+y-1=0的解，则m的平方根是。 19.关于x的不等式(a+1)xa+1的解集为x1，那么a的取值范围是。 20.如果不等式2x-m0的正整数解有3个，则m的取值范围是。
高考英语单句改错200题(带详细解析)
单句改错 ( 1 ) 1.Chuck is a businessman who is always very busy that he has little time for his friends. 2.The number of people who learns English as a foreign language is more than 750 millions. 3.Except the differences in spelling, written English is more or less the same in both British and American English. 4.You will get close to the nature and take exercise at the same time. 5.You should not go rafting if you know how to swim. 6.The teacher told the students not to look out the window. 7.How many pages have you read? 8.In the Bronze Age, people could make tools from copper and bronze. 9.It?s useless try to argue with Shylock. 10.After five hours? drive, they reached where they thought was the place they?d been dreaming of. ( 2 ) 11.Every great culture in the past had its own ideas of beauty expressing in art and architecture. 12.It is said that the weather will last hot for another three or four days. 13.The teacher wanted to speak to the student about her writing, he sent another student to tell her to his office. 14.When I entered the classroom, I saw some strangers seating at the back. 15.Don?t treat that the students do in their spare time as something unimportant. 16.I?m feeling much better now, so you mustn?t call the doctor. 17.Mr Yang became a teacher in 1986, he will been teaching for 20 years by July. 18.The boy is very afraid that his mother will scold him.
七年级下册数学典型题易错题整理
七年级下册数学典型题、易错题整理 1、在下列说法中： （1）0.09是0.81的平方根；（2）-9的平方根是±3；（3）（-5）2的算术平方 根是-5；（4）32-是个负数；（5）已知a 是实数，则||2a a =；（6）全体实 数和数轴上的点是一一对应，正确的个数是（ ） A 、1 B 、2 C 、3 D 、4 2、若方程()()22930m x m x y ----=是关于x y 、的二元一次方程，则m 的值为 （ ） A. 3± B. 3 C. -3 D. 9 3、不等式组 的解集表示在数轴上为（） 4、已知关于x 的不等式组 无解，则a 的取值范围是（ ） A 、1-≤a B 、1-a C 、21<<-a D 、2≥a 5、平面直角坐标系内AB∥y 轴，AB=5，点A 的坐标为（-5，3），则点B 的坐标为（ ） A ．（-5，8） B ．（0，3） C ．（-5，8）或（-5，-2） D ．（0，3）或（-10，3） 6、已知整数a 1，a 2，a 3，a 4，…满足下列条件：a 1=0，a 2=-|a 1+1|，a 3=-|a 2+2|，a 4=-|a 3+3|，…，依此类推，则a 2012的值为（） A ．-1005 B ．-1006 C ．-1007 D ．-2012 7、2006年我市有23 000名初中毕业生参加了升学考试，为了解23 000名考生的升学成绩，从中抽取了200名考生的试卷进行统计分析，以下说法正确的是（ ） -1-1(D)(C) (B) 3 3 22100??-≤-2 5x ??? ??>-> 七年级下册经典易错习题 一、填空题 1.一个数的平方等于它本身，这个数是；一个数的平方根等于它本身，这个数是；一个数的算术平方根等于它本身，这个数是；一个数的立方等于它本身，这个数是；一个数的立方根等于它本身，这个数是；一个数的倒数是它本身，这个数是；一个数的绝对值等于它本身，这个数是。 2.16的平方根为，= 16，16的平方根等于 . 3. ；， 则。 4.已知一个正数的两个平方根分别为3x-5和x-7，则这个正数为 . 5.17-1的整数部分为；小数部分为；绝对值为；相反数为 . 6. 如图，在数轴上，1 的对应点是A、B， A是 线段BC的中点，则点C所表示的数是。 7.已知，OA⊥OC，且∠AOB：∠AOC=2：3，则∠BOC的度数为。 8.如果∠1=80°，∠2的两边分别与∠1的两边平行，那么∠2= 。 9.已知点A（1+m，2m+1）在x轴上，则点A坐标为。 10.已知AB∥x轴，A点的坐标为（3，2），并且AB＝5，则B的坐标为 . 11.点P(a-2,2a+3)到两坐标轴距离相等,则a= . 12.将点A（1，－3）向右平移2个单位，再向下平移2个单位后得到点B（a，b），则ab＝． 13.已知平面直角坐标系内点P的坐标为(-1,3),如果将平面直角坐标系向左平移3个单位,再向下平移2个单位,那么平移后点P的坐标为________. 14.在平面直角坐标系中，已知A（2，-2），在y轴上确定一点P，使△AOP为等腰三角形，则符合条件的点P共有个。 15.点P（a+5，a）不可能在第象限。 16．平面直角坐标系内有一点P（x，y），满足x =0 y，则点P在 17.方程5 2= +y x在正整数范围内的解是_____ 。 18.已知x=1，y=﹣8是方程mx+y－1=0的解，则m的平方根是。 19.关于x的不等式（a+1）x＞a+1的解集为x＜1，那么a的取值范围是。 20.如果不等式2x－m≤0的正整数解有3个，则m的取值范围是。 21.一元一次不等式组 x a x b ? ? ? ＞ ＞ 的解集是x＞a，则a与b的关系是。 x 高中英语单句改错综合练习30题 1.I hold my lunch-box in my hand when I was going to school. 2.Then I invited Li Ming over in my place. We listen to my CDs together and soon became best friends. 3.Since then----we had been allowing tomatoes to self seed where they please 4. As she did this, lots of tea splashed on his T-shirt. 5. And after many attempts, she passed her driving test and told her husband that, to celebrate, he was going to drive him over to France for a holiday. 6..)I learned early in life that I had to be more patient and little aggressive. 7.. Unfortunate, I had an accident and hit another car. . . 8. I was really disappointed and about to leave when he walked out a building. 9.Luckily I had all my money on my pocket. 10. After we left, I said, “That was very nice of you, Mother. So I didn’t think she looked like Grandma. ”“Neither did I, ”said Mo cheerfully. 11.I didn’t have my camera with me at that time, but I rushed back E D C B A 例1 如图，直线AB,CD,EF 相交于点O ，∠AOE=54°，∠EOD=90°，求∠EOB ，∠COB 的度数。 例2 如图AD 平分∠CAE ，∠B = 350°，∠DAE=600°，那么∠ACB 等于多少？ 例3 三角形的一个外角等于与它相邻的内角的4倍，等于与它不 相邻的一个内角的2倍，则这个三角形各角的度数为( )。 A ．450、450、900 B ．300、600、900 C ．250、250、1300 D ．360、720、720 例4 已知如图，求∠A ＋∠B ＋∠C ＋∠D ＋∠E ＋∠F 的度 数。 例5 如图，AB ∥CD ，EF 分别与AB 、CD 交于G 、H ，MN ⊥AB 于G ，∠CHG=1240，则∠EGM 等于多少度？ E D C B A 21 F E D C B A N M H G F E D C B A 例1 一个机器人从O 点出发，向正东方向走3米到达A1点，再向正北方向走6米到达A2点，再向正西方向走9米到达A3点，再向正南方向走12米到达A4点，再向正东方向走15米到达A5?点，如果A1求坐标为（3，0），求点 A5?的坐标。 例2 如图是在方格纸上画出的小旗图案，若用(0，0)表示A 点，(0，4)表示B 点，那么C 点的位置可表示为( ) A 、(0，3) B 、(2，3) C 、(3，2) D 、(3，0) 例3 如图2，根据坐标平面内点的位置，写出以下各点的坐标： A( )，B( )，C( )。 例4 如图，面积为12cm2的△ABC 向x 轴正方向平移至△DEF 的位置，相应的坐标如图所示（a ，b 为常数）， （1）、求点D 、E 的坐标 （2）、求四边形ACED 的面积。 A B C 例2 高中英语单句改错专练高中英语单句改错250题 附答案 导读：就爱阅读网友为您分享以下“高中英语单句改错250题附答案”资讯，希望对您有所帮助，感谢您对的支持! 一、单句改错（仅有一处错误） preposition mistakes介词错误(using wrong prepositions or unnecessary or lack of prepositions) 1. We often play football in Saturday afternoon. 2. The doctor gave him some advice about his illness. 3. You are wanted by the phone. 4. He asked me where I’d like to go to. 5. His uncle is a man of a lot of money. 6. Fish can’t live with water. 7. She married to a man she didn’t love at all. 8. I will call on your office tomorrow. 9. He told me he didn’t agree with the plan. 10. It seems that he has a chance to get on the top of the army. 11. It’s kind for you to come to see us. 12. The class is made up from 8 groups. 13. He makes a living for teaching. 14. We drove over the forest and got to the farm. 15. When the teacher came in the classroom, we were laughing. 16. Beijing is to the north of China. 17. Taiwan is to the east of China. 18. The letters PRC stand with the People’s Republic of China. 19. He kept in touch to his old friends. 20. Hangzhou is famous as its beautiful scenery. 21. You will see the house in the right. 22. They said they’d be in holiday in the countryside. 23. For a result of the limited land, it can’t provide so much grain. 24. In China the needle treatment dates in ancient times. 25. The meeting was put off with a certain reason. 26. He used to listen to the news by the radio. 27. Why did you get up so early in this morning? 单句改错题及答案 1. three clothes ( three suits of clothes) 2. four trousers ( four pairs of trousers) 3. a bread (a loaf) 4. a work (a job)8. two advice ( two pieces of advice) 9. a clothing ( an article of clothing)10. three furniture ( three pieces of furniture) 11. a news (a piece of news)12. We are all paid by (the) hour. 13. It was (on) National Day of 1986 that they got married. 14. The Spring Festival is drawing nearly. (near) 15. We had (a) very cold winter last year. 17. Allen usually has the lunch in his company. (去the) 18. Can you play the football? (去the) 19. Y ou did me such great a kindness. (such-----so) 20. Jasmine is (a) popular tea in the east of China. 21. There was (a) heavy snow last night. 25. Please write with (a) pen. 或in pen 34. Frank is (an) honest boy, as everybody can see. 35. It was quite (an) experience when we were traveling in the African forest. 36. In the past a few years, we have made great achievements in our project. (去a) 38. I have one such a friend. (去a). 42. Let’s see who gets there the first. (去the) 43. Try the second time and you’ll succeed. (the ---a) 44. I’ll never forget that the first lesson taught by Mr. Wang. (去the) 45. Have you read his the second novel? (去the) 48. Two-thirds of (the) students are from America. 49. A quarter of the pear are eaten. (is) 50. The new playground is three time as large as the old one. (times) 51. The number of policewomen have increased twice more than it was five years ago. (has) 54. The population of China is more than that of the US by over 6 times. (larger) 55. Two hundreds students have passed the examination. (hundred) 56. There is a ten-metres-wide hole in the wall. (ten-metre-wide) 58. David is in the thirties. (his) 59. Judy is Tony’s the second daughter. (去the) 60. We are looking forward to the third trip to the West Lake. (a) 66. They used to growing flowers. (growing----grow) 67. This book is worth of being read.( of being read----reading或worth---worthy) 68. I'm sorry to have kept you waited so long.(waited----waiting) 69. They went there on foot instead of bus.(bus前加by) 70. His children as well as his wife was invited to the party.(was----were) 71. The boy broke (his) arm when he fell off the tree. 73. Linda hit George in his face. (the) 74. Little Jimmy pulled his mother by her sleeves. (the) 75. This magazine is not my magazine. My magazine is an old one. (Mine) 81. Who of you is willing to follow me? (Which) 82. How much is the price? (What) 83. Where is your address? (What) 新人教版七年级下册数学典型题、易错题整理 1、在下列说法中：（1）0.09是0.81的平方根；（2）-9的平方根是±3；（3）（-5）2的算术平方根是-5；（4）32-是个负数；（5）已知a 是实数，则 ||2a a =；（6）全体实数和数轴上的点是一一对应，正确的个数是（ ） A 、1 B 、2 C 、3 D 、4 2、若方程()()22930m x m x y ----=是关于x y 、的二元一次方程，则m 的值为 （ ） A. 3± B. 3 C. -3 D. 9 3、不等式组 的解集表示在数轴上为（） 4、已知关于x 的不等式组 无解，则a 的取值范围是（ ） A 、1-≤a B 、1-a C 、21<<-a D 、2≥a 5、平面直角坐标系内AB∥y 轴，AB=5，点A 的坐标为（-5，3），则点B 的坐标为（ ） A ．（-5，8） B ．（0，3） C ．（-5，8）或（-5，-2） D ．（0，3）或（-10，3） 6、已知整数a 1，a 2，a 3，a 4，…满足下列条件：a 1=0，a 2=-|a 1+1|，a 3=-|a 2+2|，a 4=-|a 3+3|，…，依此类推，则a 2012的值为（） A ．-1005 B ．-1006 C ．-1007 D ．-2012 7、2006年我市有23 000名初中毕业生参加了升学考试，为了解23 000名考生的升学成绩，从中抽取了200名考生的试卷进行统计分析，以下说法正确的是（ ） A ．23 000名考生是总体 B ．每名考生的成绩是个体 C ．200名考生是总体的一个样本 D ．以上说法都不正确 -1(D)(C) (B) ??-≤-2 5x ?? ? ??>-> 第五章相交线与平行线 概念定义及性质公理： 1、在平面内，不重合的两条直线的位置关系只有两种：相交与平行。 2、互为邻补角： （1）定义：如果两个角有一条公共边且有一个公共顶点，它们的另一边互为反向延长线，具有这种关系的两个角互为邻补角。 （2）性质：从位置看：互为邻角； 从数量看：互为补角； 3、互为对顶角： （1）定义：如果两个角有有一个公共顶点且它们的两边互为反向延长线，具有这种关系的两个角互为对顶角。 （2）性质：对顶角相等 4、垂直： （1）定义：垂直是相交的一种特殊情形。当两条直线相交所形成的四个角中有一个角是直角，那么这两条直线互相垂直。它们交点叫做垂足。其中的一条直线叫做另一条直线的垂线。 （2）性质：过一点有且只有一条直线和已知直线垂直。 （3）表示方法：用符号“⊥”表示垂直。 5、任何一个“定义”既可以做判定，又可以做性质。 6、垂线是一条直线，垂线段是垂线的一部分。 7、垂线段的性质：连接直线外一点与直线上各点的所有线段中，垂线段最短（简单说成：垂线段最短）。 8、区分：点到直线的距离：直线外一点到这条直线的垂线段的长度。 两点间的距离：连接两点间的线段的长度。 “两点间的距离”和“点到直线的距离”是两个不同的概念，但是“点到直线的距离”是“两点间的距离”的一种特殊情况。 9、内错角的定义：两个角都在截线的两侧，都在被截直线之间。这样的两个角叫做内错角。 10、同位角的定义：两个角都在截线的同侧，都在被截直线的同一方。这样的两个角叫做同位角。 11、同旁内角的定义：两个角都在截线的同侧，都在被截直线之间。这样的两个角叫做同旁内角。 12、截线与被截直线的定义：截线就是截断两条同一方向直线的直线，被截直线就是被截线所截断的两条同一方向的直线。 13、相交线的定义：在平面内有一个公共交点的两条直线，叫做相交线。 14、平行线： （1）定义：在平面内不相交的两条直线，叫做平行线。 （2）表示方法：用符号“∥”表示平行。 （3）公理：经过直线外一点，有且只有一条直线与已知直线平行（这个公理说明了平行线的存在性和唯一性）。 （4）推论：如果两条直线都与第三条直线平行，那么这两条直线也互相平行。 （5）判定1：两条直线被第三条直线所截，如果同位角相等，那么这两条直线互相平行（简单说成：同位角相等，两直线平行）。 判定2：两条直线被第三条直线所截，如果内错角相等，那么这两条直线互相平行（简单说成：内错角相等，两直线平行）。 判定3：两条直线被第三条直线所截，如果同旁内角相等，那么这两条直线互相平行（简单说成：同旁内角相等，两直线平行）。 判定4：在同一平面内，如果两条直线都垂直于同一条直线，那么这两条直线互相平行。 （6）性质1：如果两条平行直线被第三条直线所截，那么同位角相等（简单说成：两直线平行，同位角相等）。 性质2：如果两条平行直线被第三条直线所截，那么内错角相等（简单说成：两直线平行，内错角相等）。 性质3：如果两条平行直线被第三条直线所截，那么同旁内角相等（简单说成：两直线平行，同旁内角相等）。 15、命题 （1）定义：表示判断一件事情的语句，叫做命题。 英语单句改错100题 __________1、He asked his mother why he had become a child doctor. __________2、Han Mei jumps higher than any other girls in her school. __________3、Would you please not to make any noise? The baby has just fallen asleep. __________4、Herriot thought that it was very worth being a doctor for dogs. __________5、Don’t make the foreigner to sit in the corner. __________6、In the past few years they built a lot of new factories in their hometown. __________7、Maybe he won’t return your book back to you until tomorrow afternoon. __________8、He was seen enter George’s house ten minutes ago. __________9、There are a toy boat and some pens on the table. __________10、Some friends of my father always come to see us at the weekend. __________11、Her parents used to taking a walk after supper when they were in the country. __________12、When you come here tomorrow, take your daughter with you. __________13、What was happened to you a moment ago? __________14、He likes to receive letters but doesn’t like to write it. __________15、The boy told me that he had just given an injection from the nurse. __________16、The speaker said nearly nothing worth listening to. __________17、Would you mind to wait outside for a moment? __________18、Do you know when the League was built? __________19、Neither he or his friends will spend their holiday on the farm. __________20、How much is the price of the dress? It’s about 300 dollars each. __________21、She takes the medicine twice every day among three meals. __________22、I have looked for my key anywhere, but I can’t find it. __________23、The teachers want to make a contribution to help the poor children return to school. __________24、——How did you come here this morning? —— I came here by Mr Smith’s car. __________25、They don’t know if we are going to the museum or not. __________26、I feel like having a cup of tea. Would you like having a cup of tea, too? __________27、All the women who is busy working on the farm will have a five-day holiday. __________28、Although he didn’t feel well, but the finished his work on time. __________29、The schoolboy could hardly catch the train yesterday morning, couldn’t he? __________30、I hope you to become a scientist in the future. __________31、His parents enjoy fishing at weekend, and so does mine. __________32、Mother often tells me not to buy anything I needn’t. __________33、Under Lily’s help. She finished her homework before supper. __________34、That book was written by LuXun is my favourite. __________35、His mother has left home for three years. __________36、I don’t think none of the programmes is interesting. __________37、Last Monday, father said that he would leave for Beijing next day. __________38、I was so exciting that I couldn’t say a word. __________39、Do you know where the next Olympic Games will hold? __________40、How many is the population of China? __________41、Who did you talk about the accident? __________42、We’d like to pay a visit the History Museum of China next week. __________43、He has no room to live. __________44、I don’t think this pair of trousers are yours. __________45、By who was this novel written? __________46、Now computers are wide used in offices and families. __________47、It was too noise that evening and I couldn’t get to sleep. __________48、There will be rainy tomorrow, do you know? __________49、The apples on the tree are hard to reach them. __________50、He’s been surfing every day. It’s such a great fun. __________51、So far, no man traveled farther than the moon. __________52、My brother sings quite better than Xiao Li. __________53、I often go cross the bridge on my way to my home. __________54、Two fifth of the students are League member, aren’t they? __________55、How long will they arrive at the airport? In 10 minutes. __________56、The meeting had begun for ten minutes when I got there. __________57、Hi, boy. Why are you doing that for?2017人教版最新教材七年级数学下册经典易错题
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