实用标准文档
精彩文案Chapter1 Geographical Features and Natural Resources
1.In area, the United States is the 4th largest country in the world.
2.The Midwest in the US refers to the region around the Great Lakes and the upper Mississippi Valley.
3.The Backbone of North America refers to the Rocky Mountains
4.Death Valley is on the western edge of the Great Basin.
5.The Great Plains might have a dust storm in summer.
6.The western part of Washington State h as the highest rainfall in the US.
7.The US primary suppliers of foreign oil are the following countries except Japan
8.The US largest open-pit copper-mining center is in Utah.
1. The United States is bordered on the north by Canada, on the south by Mexico and the Guff of Mexico, on the east by the Atlantic Ocean, and on the west by the Pacific Ocean.
2. The large territory of the continental US is divided into three basic areas:
A. the Atlantic seacoast west to the Appalachians
B. the Mississippi River Basin
C. the Rockies west to the Pacific
3. The Middle Atlantic States are the most densely populated region in the US, where the land is flat and fertile.
4. The Central Valley of California is a highly productive area, which produced enormous amounts of fruits and vegetables.
5. Most production of oil and natural gas in the US comes from offshore areas of Louisiana and Texas, a nd from onshore areas of Texas, Oklahoma a nd California. Her big consumption of energy now has made America insufficient in oil supply. The US reliance of foreign oil has reminded consistently in the 40% ranges.
6. The United States has little trouble caused by the shortage of fresh water. Farmlands in the US making up about 12% of the arable lands in the world, and they are among the richest and most productive.
Chapter 2 American Population
1.The over 3 million of early Americans in 1790 were mostly of British ancestry.
2.About 700,000 immigrants were legally received by the US each year during the 1980s.
3.The official racial segregation continued to be the law of the US until 195
4.
4.American Indians now mainly live in the South.
5.The majority of American Hispanics are from the following countries except Spain.
6.The West now leads in percentage increase in population.
7.According to the 1994 US census, the second most populous state in the US is Taxes.
8.The trend in migration from cities to suburbs now prevailed in all regions except the South.
1.The United States is the third most populous nation in the world.
2.Prior to 1875 anyone from any country could enter the US freely and take up permanent residence there. Later the US Congress passed laws restricting immigration on the basis of morality, race, and national origin. The 1952 Immigration and Nationality Act reaffirmed national origin as the chief criterion for eligibility and established a preferential system for skilled workers and for relatives of the US citizens. For many years the US restricted to total number of immigrants to 270,000 each year, although the real immigrants numbered much greater than the limit. The 1990 Immigration Act limits
the total number of immigrants to 700,000 from 1992 to 1995 and 675,000 thereafter.
3.The first blacks arrived in Jamestown in 1619 as indentured servants,but soon[ after 1619 they were brought to colonies
as slaves.The blacks were formally freed in1863, but continued to suffer the institutionalized segregation for about a century. Today many blacks still live in the South, some have entered the middle class, but one-third of all black families
still live below the poverty line.
4.The Chinese-Americans have proved to be industrious and intelligent. They are now viewed as a “
model minority” in the US. According to the 2010 US census, there were about 3.8 million Chinese-Americans living in the US. The figure was more than twice what it was in 1990.
Chapter 3 Discovery and Colonization of the New World
1. The ancestors of the present American Indians came from Asia.
2.“The ambition for the vast lands”is not correct to explain the reasons for the sudden daring exploration of the unknown in the mid-15th century.
实用标准文档 精彩文案Chapter1 Geographical Features and Natural Resources 1.In area, the United States is the 4th largest country in the world. 2.The Midwest in the US refers to the region around the Great Lakes and the upper Mississippi Valley. 3.The Backbone of North America refers to the Rocky Mountains 4.Death Valley is on the western edge of the Great Basin. 5.The Great Plains might have a dust storm in summer. 6.The western part of Washington State h as the highest rainfall in the US. 7.The US primary suppliers of foreign oil are the following countries except Japan 8.The US largest open-pit copper-mining center is in Utah. 1. The United States is bordered on the north by Canada, on the south by Mexico and the Guff of Mexico, on the east by the Atlantic Ocean, and on the west by the Pacific Ocean. 2. The large territory of the continental US is divided into three basic areas: A. the Atlantic seacoast west to the Appalachians B. the Mississippi River Basin C. the Rockies west to the Pacific 3. The Middle Atlantic States are the most densely populated region in the US, where the land is flat and fertile. 4. The Central Valley of California is a highly productive area, which produced enormous amounts of fruits and vegetables. 5. Most production of oil and natural gas in the US comes from offshore areas of Louisiana and Texas, a nd from onshore areas of Texas, Oklahoma a nd California. Her big consumption of energy now has made America insufficient in oil supply. The US reliance of foreign oil has reminded consistently in the 40% ranges. 6. The United States has little trouble caused by the shortage of fresh water. Farmlands in the US making up about 12% of the arable lands in the world, and they are among the richest and most productive. Chapter 2 American Population 1.The over 3 million of early Americans in 1790 were mostly of British ancestry. 2.About 700,000 immigrants were legally received by the US each year during the 1980s. 3.The official racial segregation continued to be the law of the US until 195 4. 4.American Indians now mainly live in the South. 5.The majority of American Hispanics are from the following countries except Spain. 6.The West now leads in percentage increase in population. 7.According to the 1994 US census, the second most populous state in the US is Taxes. 8.The trend in migration from cities to suburbs now prevailed in all regions except the South. 1.The United States is the third most populous nation in the world. 2.Prior to 1875 anyone from any country could enter the US freely and take up permanent residence there. Later the US Congress passed laws restricting immigration on the basis of morality, race, and national origin. The 1952 Immigration and Nationality Act reaffirmed national origin as the chief criterion for eligibility and established a preferential system for skilled workers and for relatives of the US citizens. For many years the US restricted to total number of immigrants to 270,000 each year, although the real immigrants numbered much greater than the limit. The 1990 Immigration Act limits the total number of immigrants to 700,000 from 1992 to 1995 and 675,000 thereafter. 3.The first blacks arrived in Jamestown in 1619 as indentured servants,but soon[ after 1619 they were brought to colonies as slaves.The blacks were formally freed in1863, but continued to suffer the institutionalized segregation for about a century. Today many blacks still live in the South, some have entered the middle class, but one-third of all black families still live below the poverty line. 4.The Chinese-Americans have proved to be industrious and intelligent. They are now viewed as a “ model minority” in the US. According to the 2010 US census, there were about 3.8 million Chinese-Americans living in the US. The figure was more than twice what it was in 1990. Chapter 3 Discovery and Colonization of the New World 1. The ancestors of the present American Indians came from Asia. 2.“The ambition for the vast lands”is not correct to explain the reasons for the sudden daring exploration of the unknown in the mid-15th century.
小学六年级英语填空题 根据题示填写单词。 1.Too (太多的)junk food is (不好)for our healthy. 2.We want (十束花)。3．Turn right at .(拐弯) 4．（小心点）！The window is broken. 5.She (累) last night, she went to sleep early. 6.The rabbit can (跑得快). 7.His father went to Beijing .(乘飞机) 8．How are they going to ( 到达那儿). 9.We (不得不)stay up late. 10.It’s dangerous. We should (小心点). 11.Too much junk food .( 不健康) 12.How much are two (盒)of milk? 13.I was at the (地铁站)at 3:15 yesterday, I (正在等候) my friend. 14.Why was Gogo (哭) (安静地)? 15. (直走),our school is (在……对面)the park. 16.We’re going to (去观光).
17.I’m going to HongKong .(乘坐公共汽车) 18.I was at the subway station. I was .(等我的朋友) 19. Why was he crying (大声地)? 20.They will (住在旅馆里)in Shanghai. 21. (首先) , I woke up late. (紧接着), I missed the bus. (然后),I forgot my homework. 22.Can you help me? （当然可以）I can. 23. , Jenny!(小心点) 24．This morning, my little brother got a (成绩不好)，he was sad. https://www.doczj.com/doc/0d1768097.html,st night, I (听见) a noise. 26.Do you (通常乘出租车)to school? No. 27.I was happy yesterday. I .(比赛获胜) 28．She (患感冒). She is now (在家)。29．I have (好主意). Let’s buy some envelopes and some .(邮票) 30．Go (直走)to the end of the street. Turn (向右转). You’ll see the bank at the (拐角).The bookstore is from(在对面) the bank. 31.The rabbit runs (迅速地)，but the turtle walks (缓慢地).
立体几何小题难题训练 一．选择题 1．已知正方体ABCD﹣A1B1C1D1，则过点A与AB、BC、CC1所成角均相等的直线有（） A．1条 B．2条 C．4条 D．无数条 2．如图，平面PAB⊥平面α，AB?α，且△PAB为正三角形，点D是平面α内的动点，ABCD是菱形，点O为AB中点，AC与OD交于点Q，I?α，且l⊥AB，则PQ与I所成角的正切值的最小值为（） A．B．C．D．3 3．如图，点E为正方形ABCD边CD上异于点C，D的动点，将△ADE沿AE翻折成△SAE，使得平面SAE⊥平面ABCE，则下列说法中正确的有（） ①存在点E使得直线SA⊥平面SBC； ②平面SBC内存在直线与SA平行 ③平面ABCE内存在直线与平面SAE平行； ④存在点E使得SE⊥BA． A．1个 B．2个 C．3个 D．4个 4．设三棱柱ABC﹣A1B1C1的侧棱与底面垂直，∠BCA=90°，BC=CA=2，若该棱柱的所有顶点都在体积为的球面上，则直线B1C与直线AC1所成角的余弦值为（） A． B．C．D．
5．已知异面直线a与b所成的角为50°，P为空间一点，则过点P与a、b所成的角都是30°的直线有且仅有（） A．1条 B．2条 C．3条 D．4条 6．已知矩形ABCD，AB=1，BC=．将△ABD沿矩形的对角线BD所在的直线进行翻折，在翻折过程中（） A．存在某个位置，使得直线AC与直线BD垂直 B．存在某个位置，使得直线AB与直线CD垂直 C．存在某个位置，使得直线AD与直线BC垂直 D．对任意位置，三对直线“AC与BD”，“AB与CD”，“AD与BC”均不垂直 7．在正方体ABCD﹣A1B1C1D1中，E，F分别为棱AA1，CC1的中点，则在空间中与三条直线A1D1，EF，CD都相交的直线（） A．不存在B．有且只有两条C．有且只有三条D．有无数条 8．正方体ABCD﹣A1B1C1D1中，M，N，Q分别是棱D1C1，A1D1，BC的中点，点P在对角线BD1上，给出以下命题： ①当P在BD1上运动时，恒有MN∥面APC； ②若A，P，M三点共线，则=； ③若=，则C1Q∥面APC； ④若过点P且与正方体的十二条棱所成的角都相等的直线有m条；过点P且与直线AB1和A1C1所成的角都为60°的直线有n条，则m+n=7． 其中正确命题的个数为（） A．1 B．2 C．3 D．4
请判断每组划线部分发音是“√”否“×”一致。（5分） 1. try yes fly ( ) 2. class car park ( ) 3. slow sleep small ( ) 4. goose cool school ( ) 5. dear bear pear ( ) 单项选择：(10) （）1.That interesting. I want___her one day. A.meet B. To meet C, meeting D.to meeting ( )2._____Sundays, we often go____a walk after supper. A. On; for B.At; to C.In; for D.At;for ( )3.Whose bagis ____,yours or mine? A.heavy B.heavyer C.the heavy D. Heavier ( )4.Why not _____to music ,Jim? A.listening B.to listen C.listen D.to listening ( )7.Mr Li is_____than Mr Wu. Mr Wu is ____than Mr Li. A. Fatter; thinner B.fat; tinner C.fatter ;thin D.fat; thin ( )8.Excuse me ._____do you say that in English? A.When B.What C.How D.Where ( )9.The boy is 160cm. I am 160cm.The boy is____me. A.taller than B.as btaller as Ctall as D.as tall as ( )10.---What's the weather like today? ----It's_______. A.sun and wind B.sunny and windy C.sunny and wind D.sun and windy 情景搭配：(10) I II ( )1.Do you have any problem? A.No, I don't. ( )2.Can you tell me the way to B.No, he doesn't. post office? ( )3.How far is it from here? C.OK, let me see. ( )4.How many stops are there? D.It's about a kilometre ( )5.Does Jim run faster than Tom? E.Only two. 选择填空。(5) 1. Ben____(run; runs)faster than his father. 2.______(do; does) Tom swim_____(slow;slower) than Lu Tao? 3.The traffic is ____(heavy;heavier) as my mother. 4.I'm as_____(tall;taller) as my mother. 5.Yang Ling does____(well;better) in English than Su Yang. 1 / 2
Chapter1 Geographical Features and Natural Resources 1.In area, the United States is the 4th largest country in the world. 2.The Midwest in the US refers to the region around the Great Lakes and the upper Mississippi Valley. 3.The Backbone of North America refers to the Rocky Mountains 4.Death Valley is on the western edge of the Great Basin. 5.The Great Plains might have a dust storm in summer. 6.The western part of Washington State has the highest rainfall in the US. 7.The US primary suppliers of foreign oil are the following countries except Japan 8.The US largest open-pit copper-mining center is in Utah. 1. The United States is bordered on the north by Canada, on the south by Mexico and the Guff of Mexico,on the east by the Atlantic Ocean , and on the west by the Pacific Ocean. 2.The large territory of the continental US is divided into three basic areas: A. the Atlantic seacoast west to the Appalachians B. the Mississippi River Basin C. the Rockies west to the Pacific 3. The Middle Atlantic States are the most densely populated region in the US, where the land is flat and fertile. 4. The Central Valley of California is a highly productive area, which produced enormous amounts of fruits and vegetables. 5. Most production of oil and natural gas in the US comes from offshore areas of Louisiana and Texas, and from onshore areas of Texas, Oklahoma and California. Her big consumption of energy now has made America insufficient in oil supply. The US reliance of foreign oil has reminded consistently in the 40% ranges. 6. The United States has little trouble caused by the shortage of fresh water. Farmlands in the US making up about 12% of the arable lands in the world, and they are among the richest and most productive. Chapter 2 American Population 1.The over 3 million of early Americans in 1790 were mostly of British ancestry. 2.About 700,000 immigrants were legally received by the US each year during the 1980s. 3.The official racial segregation continued to be the law of the US until 195 4. 4.American Indians now mainly live in the South . 5.The majority of American Hispanics are from the following countries except Spain. 6.The West now leads in percentage increase in population. 7.According to the 1994 US census, the second most populous state in the US is Taxes. 8.The trend in migration from cities to suburbs now prevailed in all regions except the South . 1.The United States is the third most populous nation in the world. 2.Prior to 1875 anyone from any country could enter the US freely and take up permanent residence there. Later the US Congress passed laws restricting immigration on the basis of morality, race , and national origin. The 1952 Immigration and Nationality Act reaffirmed national origin as the chief criterion for eligibility and established a preferential system for skilled workers and for relatives of the US citizens. For many years the US restricted to total number of immigrants to 270,000 each year, although the real immigrants numbered much greater than the limit. The 1990 Immigration Act limits the total number of immigrants to 700,000 from 1992 to 1995 and 675,000 thereafter. 3.The first blacks arrived in Jamestown in 1619 as indentured servants, but soon[ after 1619 they were brought to colonies as slaves. The blacks were formally freed in 1863, but continued to suffer the institutionalized segregation for about a century. Today many blacks still live in the South, some have entered the middle class, but one-third of all black families still live below the poverty line . 4.The Chinese-Americans have proved to be industrious and intelligent. They are now viewed as a model“minority ” in the US. According to the 2010 US census, there were about 3.8 million Chinese-Americans living in the US. The figure was more than twice what it was in 1990. Chapter 3 Discovery and Colonization of the New World 1. The ancestors of the present American Indians came from Asia. 2.“ Theambition for the vast lands”is not correct to explain the reasons for the sudden daring exploration of the unknown in the mid-15 th century. 3.On his voyage of 1492, Columbus expected to reach India . 4.Vasco da Gama discovered the route to India. 5.John Cabot was sent by the English King to explore the new way to the east.
Ⅰ用适当形式填空. 1. He __________ back a month ago. (come) 2. My mother often tells me __________ in bed. (not read) 3. I must take it back the day after tomorrow. You can only __________ it for 24 hours. (keep) 4. Why have you kept me __________ here for so long a time? (wait) 5. Please come to our meeting if you __________ free tomorrow. (be) 6. What time ______ the shop ______ (close)? It _____ (close) at nine o'clock in the evening. 7. In his letter, he said that he __________ us very much. (miss) 8. He ______ (go) to school by bus every day. 9. He said he became __________ in physics. (interest) 10. This film is worth __________. (see) 11. He went to school instead of __________ home. (go) 12. In the old days it was difficult for the poor to __________ a job. ( find) 13. It's cold outside, so you'd better __________ your coat. (put on) 14. He is hungry. Please give him something __________. (eat) 15. Please don't waste time __________ TV every evening. You should word hard at English. (watch) 16. She_____________ (give) me a book a moment ago. 17. You___________your pencil. (pick) 18. Mother often tells me __________ too late. (not come home) 19. You had better __________ by bus, or you will be late. (go) 20. I will __________ Li Ming the good news as soon as I see him.( tell) 21. Miss Guo ______ (teach) us Chinese this term. She ______ (be) a very good teacher. She often ______ (talk) with us after class. Many of us like ______ (talk) with her. 22. Where ______ their father______ (work)? He ______ (work) on a farm. 23. It __________ me two days to write the article. (took) 24. Don't touch that __________ child. (sleep) 25. He usually _____ up at 17:00. (get) 26. The girl___________ (get) up very early this morning. 27. They____________ (take) photos near the river an hour ago. 28. He ____________(not watch) TV yesterday evening.29. 30. Yesterday Mary couldn't finish her homework, so she has to go on __________ it this afternoon. (do) 31. I_______________ (buy) a new dictionary the day before yesterday. 32 —What day_____________ (be) it yesterday? —It______________ (be) Friday. 33 He______________ (be) here half an hour ago. 34. Last night we __________ back home until the teacher left school. (not go) 35. I___________ (see) him in the library two days ago. 36. She_________ (write) her address on the blackboard ten minutes ago. 37. We could not help __________ after we heard the story. (laugh) 38. Would you please __________ me an English-Chinese dictionary when you come? (bring) 39. I_____________ (sing) an English song. 40. I'll tell him the news as soon as he __________ back. (come) 41. The boy __________ by the door is my brother. (stand) 42. Do you remember __________ the film last year? (see) 43. There __________ a physics test next Monday. (be) 44. __________ I finish my homework in class? (必须) No, you needn't. 45. I'm sorry you've missed the last bus. It __________ ten minutes ago. (leave) 46. Wei Fang is heard __________ English every morning. (hear) 47. What_________you__________ (do)?
数学立体几何练习题 一、选择题：本大题共8小题，每小题5分，共40分．在每小题给出的四个选项中，只有一个是符合题目要求的． 1．如图，在正方体ABCD －A 1B 1C 1D 1中，棱长为a ，M 、N 分别为A 1B 和AC 上 的点，A 1M ＝AN ＝ 2a 3 ，则MN 与平面BB 1C 1C 的位置关系是( ) A ．相交 B ．平行 C ．垂直 D ．不能确定 2．将正方形ABCD 沿对角线BD 折起，使平面ABD ⊥平面CBD ，E 是CD 中点，则AED ∠的大小为（ ） A.45 B.30 C.60 D.90 3．PA ，PB ，PC 是从P 引出的三条射线，每两条的夹角都是60o，则直线PC 与平面PAB 所成的角的余弦值为（ ） A ． 12 B C D 4．正方体ABCD —A 1B 1C 1D 1中，E 、F 分别是AA 1与CC 1的中点，则直线ED 与D 1F 所成角的余弦值是 A ． 15 B 。13 C 。 12 D 5． 在棱长为2的正方体1111D C B A ABCD -中，O 是底面ABCD 的中心，E 、F 分别是1CC 、 AD 的中点，那么异面直线OE 和1FD 所成的角的余弦值等于（ ） A ．510 B ．3 2 C ．55 D ．515 6．在正三棱柱ABC-A 1B 1C 1中，若AB=2，A A 1=1，则点A 到平面A 1BC 的距离为（ ） A ． 4 3 B ． 2 3 C ． 4 3 3 D ．3 7．在正三棱柱ABC-A 1B 1C 1中，若AB=2BB 1,则AB 1与C 1B 所成的角的大小为 （ ） A.60o B. 90o C.105o D. 75o 8．设E ，F 是正方体AC 1的棱AB 和D 1C 1的中点，在正方体的12条面对角线中，与截面 A 1ECF 成60°角的对角线的数目是（ ） A ．0 B ．2 C ．4 D ．6 二、填空题：本大题共6小题，每小题5分，共30分． 9.在正方体ABCD －A 1B 1C 1D 1中，M 、N 分别为棱AA 1和BB 1的中点，则 sin 〈CM ，1D N 〉的值为_________. 10．如图，正方体的棱长为1，C 、D 分别是两条棱的中点， A 、B 、M 是顶点， 那么点M 到截面ABCD 的距离是 . A B M D C
新编英美概况- 许鲁之
Chapter 1 Geographical Features and Natural Resources 1. Choose the correct answer 1-8 CDBACBBB 2. fill in the blanks 1. Ca nada\Mexico\the Cuff of Mexico\Atla ntic Ocea n\the Pacific Ocea n 2. The Atla ntic seacoast west to the Appalacha in s\The Mississippi River Basin\The Rockies west to the Pacific 3. most den sely\flat\fertile 4. productive\fruits\vegetables 5. Louisia na\Texas\Texas\Oklahoma\Califor ni a\i nsufficie nt\4O% 6.little\fresh\12%\richest\productive Chapter 2 America n Populati on 1. Choose the correct answer 1-8 CBDACDCB 2. fill in the blanks 1. third\250 2.1875\perma nent reside nce\morality\race\nati onal origi n\n ati onal origi n\skilled\relatives\270,000\700,000\675,000 3.i nden tured serva nts\slaves\1863 4.South\poverty line 5.i ndustrious'i ntellige nt'modle min ority'twice
用动词的适当形式填空 1. I ______to school from Monday to Friday. My brother often _______to school with me. Yesterday we _______to school together. We like ________to school very much. ( go ) 2.They usually _______lunch at home. But last week, they ____lunch at school. ( have ) 3.That______my English book. It _____new. But now it _____not here. It ______there a moment ago. ( be ) 4.My sister likes ________very much. She often _______at our school festival. Last term, she _______a lot of songs in the school hall. She _____beautifully. ( sing ) 5.What _____ he usually _______on Sunday? He usually _______his homework. Look! He __________his homework now. _______he _______his homework last Sunday? Yes, he_______. ( do ) 6. Do people usually_______ moon cakes at Mid-autumn Festival? Yes, they do. Did you ________moon cakes last Mid-autumn Festival? Yes, I did. I _______a lot of delicious moon cakes. ( eat ) 7. -----How ______you? -----I _____fine. Thank you. -----Where _____you yesterday? ----I ____at home with my family
2017-2019高考文数真题分类解析 ----立体几何（选择题、填空题） 1．【2019年高考全国Ⅱ卷文数】设α，β为两个平面，则α∥β的充要条件是 A ．α内有无数条直线与β平行 B ．α内有两条相交直线与β平行 C ．α，β平行于同一条直线 D ．α，β垂直于同一平面 【答案】B 【解析】由面面平行的判定定理知：α内两条相交直线都与β平行是αβ∥的充分条件，由面面平行性质定理知，若αβ∥，则α内任意一条直线都与β平行，所以α内两条相交直线都与β平行是αβ∥的必要条件，故选B ． 【名师点睛】本题考查了空间两个平面的判定与性质及充要条件，渗透直观想象、逻辑推理素养，利用面面平行的判定定理与性质定理即可作出判断．面面平行的判定问题要紧扣面面平行判定定理，最容易犯的错误为定理记不住，凭主观臆断，如：“若,,a b a b αβ??∥，则αβ∥”此类的错误． 2．【2019年高考全国Ⅲ卷文数】如图，点N 为正方形ABCD 的中心，△ECD 为正三角形，平面ECD ⊥平面ABCD ，M 是线段ED 的中点，则 A ．BM =EN ，且直线BM ，EN 是相交直线 B ．BM ≠EN ，且直线BM ，EN 是相交直线 C ．BM =EN ，且直线BM ，EN 是异面直线 D ．BM ≠EN ，且直线BM ，EN 是异面直线 【答案】B 【解析】如图所示，作EO CD ⊥于O ，连接ON ，BD ，易得直线BM ，EN 是三角形EBD 的中线，是
相交直线. 过M 作MF OD ⊥于F ，连接BF ， Q 平面CDE ⊥平面ABCD ，,EO CD EO ⊥?平面CDE ，EO ∴⊥平面ABCD ，MF ⊥平面ABCD ， MFB ∴△与EON △均为直角三角形．设正方形边长为2，易知12EO ON EN ===,， 5 ,22 MF BF BM = =∴=BM EN ∴≠，故选B ． 【名师点睛】本题考查空间想象能力和计算能力，解答本题的关键是构造直角三角形.解答本题时，先利用垂直关系，再结合勾股定理进而解决问题． 3．【2019年高考浙江卷】祖暅是我国南北朝时代的伟大科学家，他提出的“幂势既同，则积不容异”称为祖暅原理，利用该原理可以得到柱体的体积公式V 柱体=Sh ，其中S 是柱体的底面积，h 是柱体的高．若某柱体的三视图如图所示（单位：cm ），则该柱体的体积（单位：cm 3）是 A ．158 B ．162 C ．182 D ．324 【答案】B 【解析】由三视图得该棱柱的高为6，底面可以看作是由两个直角梯形组合而成的，其中一个上底为4，