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备战中考英语专题训练——冠词练习题附答案

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备战中考英语专题训练——冠词练习题附答案

冠词分三种：定冠词the，零冠词/,不定冠词a/an.

一、定冠词the的用法：

①特指某些人或物

②谈话双方都熟悉的人或事

③上文已经提到的人或事

④世界上独一无二的事物前

⑤序数词回形容词最高级前

⑥某些专有名词前

⑦一些习惯短语（如：intheday等）中和乐器前（如：playtheviolin/piano）

二、不用冠词（零冠词）

①名词前已有作定语用的this、that、some、any、my等限定词。

②专有名词和不可数名词前。

③表示学科的名词前。

④球类活动的名词前及三餐总称前。

⑤复数名词表示泛指（一类人或事）时。

⑥节日、季节、星期、月份前。

⑦表示颜色、语种和国家的非全称名词。

⑧在称呼或表示头衔的名词前。

⑨某些习惯短语中（如：inbed、gotoschool等）。

冠词用法口诀：口诀一名词是秃子常要戴帽子可数名词单需用a或an辅音前用a元音前用an复数不可数泛指the不见碰到代词时,冠词均不现。

口诀二（定冠词）特指双熟悉上文已提及世上独无二序数最高级某些专有名习语和乐器。

口诀三（零冠词）代词限定名词前专有名词不可数学科球类三餐饭两季星期月份前颜色语种和国名称呼习语和头衔。

一、根据语境用适当的冠词填空，用零冠词的地方划“/”。

1．The Changjiang is _____ longest river in our country. 2．Here is a picture of a modern car factory. My father works in _____ factory.

3．______ girl in red is my sister.

4．Can you see _____ sun in the sky?

5．He used to be _____ engineer.

6．Give me _____ pen, please.

7．______ underground train can start and stop quickly.

8．_____ boy is waiting for me.

9．A dictionary is _____ useful book.

10．119 is _____ telephone number.

11．There is ____ “R” in the word “red”.

12．Her parents lived in a small far away village in _______ north.

13．It's _______ dream come true for me.

14．I have ________ uncle and he is a teacher.

15．She has a pen. ________ pen is blue.

16．Please don’t shout at her. She is only____eight-year-old girl.

17．—Have you read a book called The Merchant of Venice?

—Yes.___________book is very interesting.

18．Qu Dongyu is ________ official(官员) of the United Nations, who is from

Yongzhou.

19．The boy went to school by_________, but there was a road accident.

20．—John and I will(将) go to the movie My People My Country (《我和我的祖国》)”

—It's raining outside. You'd better(最好) take________ umbrella to the cinema.

21．It is unusual for an armless boy to play ___________ piano so well with his feet.

22．—Do you like ________ movie Sing?

—Yes. I think it's ________ most interesting movie this year.

23．My brother was good at playing ________ football when he was young.

24．After ________ quick lunch, Harry ran to school.

25．—Who's ________ boy in black over there?

—My cousin Mike. He is ________ friendly boy. 26．It's ________ interesting story for all the children.

27．________ Smiths are having ________ lunch now.

28．My mum plays ________ piano very well.

29．—Does John go to school by ________ bike?

—No. He takes ________ bus.

30．There is __________ picture of __________ elephant on __________ wall.

31．This is __________ useful book. I’ve read it for __________ hour.

32．__________ elephant is much heavier than __________ horse.

33．__________ doctor told him to take __________ medicine three times ______

day.

34．Let’s go out for __________ walk.

35．It’s too hot. Open __________ door, please.

36．There is __________ woman over there, __________ woman is Meimei’s

mother.

37．__________ sun rises in __________ east.

38．__________ Changjiang River is __________ longest river in __________

China.

39．Are you going to do it __________ second time?

【参考答案】

1．The 2．The 3．The 4．The 5．An 6．A 7．An 8．A 9．a

10．a 11．An 12．The 13．A 14．An 15．The 16．An 17．The

18．An 19．bus/bike 20．An 21．the 22． the the 23．/ 24．a

25． the a 26．An 27． The / 28．The 29． / a / the

30． a an the 31． a an 32． An a 33． The the a

34．a 35．The 36． a the 37． The the

38． The the × 39．a

二、单选题

1．—Wudang Mountain is ________ good place to visit.

—So it is. And it is famous for the Golden Palace.

A．the B．a C．an D．/

2．Lin Tao is from a small village.

A．a 11 years old boy B．a 11-year-old boy C．an 11-years-old boy D．an 11-year-old boy

3．Can you play ________ guitar and play ________ chess ?

A．the ; the B．/ ; the C．the ; /

4．The magazine can’t be taken out of the reading room for _______ time being.

A．a B．an C．the D．/

5．The young manager dealt with his business problems in ________ unusual way.

A．a B．an C．the D．/

6．To save time (省时), many students have ________ lunch at school every day.

A．a B．an C．the D．/

7．—Do you know ________ tall man in ________ front of the school gate?

—Sorry, I don’t know.

A．a; / B．an; the C．the; / D．a; the

8．This was such ________ easy question that everyone could answer it without

difficulty.

A．a B．an C．the D．/

9．There is _________ “u” and _________ “s” in the word “soup”.

A．an; an B．a; an C．an; a D．a; a

10．Tina studies in ________ university in Beijing, and now she is preparing

for ________ exam.

A．a; an B．an; a C．an; an

11．Simon learned to play ________ violin at a very young age.

A．/ B．a C．an D．the

12．There are fifty states (州) in ________ America.

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中考数学易错题专题训练-圆的综合练习题附详细答案

中考数学易错题专题训练-圆的综合练习题附详细答案

中考数学易错题专题训练-圆的综合练习题附详细答案

一、圆的综合

1．如图，⊙O的半径为6cm，经过⊙O上一点C作⊙O的切线交半径OA的延长于点B，作∠ACO的平分线交⊙O于点D，交OA于点F，延长DA交BC于点E．

（1）求证：AC∥OD；

（2）如果DE⊥BC，求»AC的长度．

【答案】（1）证明见解析；（2）2π．

【解析】

试题分析：（1）由OC=OD，CD平分∠ACO，易证得∠ACD=∠ODC，即可证得AC∥OD；

（2）BC切⊙O于点C，DE⊥BC，易证得平行四边形ADOC是菱形，继而可证得△AOC是等边三角形，则可得：∠AOC=60°，继而求得弧AC的长度．

试题解析：（1）证明：∵OC=OD，∴∠OCD=∠ODC．∵CD平分∠ACO，∴∠OCD=∠ACD，∴∠ACD=∠ODC，∴AC∥OD；

（2）∵BC切⊙O于点C，∴BC⊥OC．∵DE⊥BC，∴OC∥DE．∵AC∥OD，∴四边形ADOC是平行四边形．∵OC=OD，∴平行四边形ADOC是菱形，∴OC=AC=OA，∴△AOC是等边三角形，∴∠AOC=60°，∴弧AC的长度=606180=2π．

点睛：本题考查了切线的性质、等腰三角形的判定与性质、菱形的判定与性质以及弧长公式．此题难度适中，注意掌握数形结合思想的应用．

2．如图，AB是⊙O的直径，PA是⊙O的切线，点C在⊙O上，CB∥PO．

（1）判断PC与⊙O的位置关系，并说明理由；

（2）若AB=6，CB=4，求PC的长．

【答案】（1）PC是⊙O的切线，理由见解析；（2）352

【解析】

试题分析：（1）要证PC是⊙O的切线，只要连接OC，再证∠PCO=90°即可． （2）可以连接AC，根据已知先证明△ACB∽△PCO，再根据勾股定理和相似三角形的性质求出PC的长．

试题解析：（1）结论：PC是⊙O的切线．

证明：连接OC

∵CB∥PO

∴∠POA=∠B，∠POC=∠OCB

备战中考物理易错题专题训练-机械效率的计算练习题附答案解析

备战中考物理易错题专题训练-机械效率的计算练习题附答案解析

一、初中物理有用功额外功总功机械效率的计算问题

1．如图所示，物体A在拉力的作用下沿水平面匀速运动了一段距离s，试比较拉力F1、F2及拉力所做的功W1、W2 的大小（滑轮重、绳重及绳与滑轮之间的摩擦不计）。下列判断正确的是

A．F1=2F2 W1=W2

B．F1=12F2 W1=12W2

C．F1=4F2 W1= W2

D．F1=14F2 W1=14W2

【答案】C

【解析】

【详解】

物体A在两种情况下的摩擦力f相等，上图滑轮是动滑轮，下图滑轮的轴固定不动，可以看做是特殊使用的定滑轮。则：

F1=2f

F2=12f

故：

F1=4F2

根据功的公式可知：

W1=F1×12s=2f×12s=fs

W2=F2×2s=12f×2s=fs

故：W1=W2，故选C。

2．小黄用图所示的滑轮组经过10s的时间，用150N的拉力将一个重270N的重物提高1m，求此过程：拉力F自由端拉出的距离是_____m；小黄所做的有用功是_______J；总功是_______J；拉力做功的功率是______W。

【答案】3 270 450 45

【解析】

【分析】

【详解】

[1]由图可知，滑轮组的承重绳子根数n=3根，则拉力自由端拉出的距离

s=nh=3×1m=3m

[2]有用功

W有用=Gh=270N×1m=270J

[3]总功

W总=Fs=150N×3m=450J

[4]拉力做功的功率

450J45W10sWPt总

3．如图所示，用滑轮组拉动重为200N的物体在水平桌面上匀速直线运动。已知F=20N，滑轮组的机械效率为85%，则物体与桌面的之间的摩擦力大小为__________N。

【答案】51

【解析】

【分析】

【详解】

由图可知，由3段绳子通过动滑轮，则sF=3s物，滑轮组的机械效率为85%，即

η=WW有总=FfsFs物 =3fF=320Nf85%

专题 哲理感悟-备战中考英语阅读理解热点话题 体裁分类训练(中考真题 各地模拟题)(含答案)

专题 哲理感悟-备战中考英语阅读理解热点话题 体裁分类训练(中考真题 各地模拟题)(含答案)

试卷第1页，共10页 备战中考英语阅读理解热点话题+体裁分类训练

(中考真题+各地模拟题)

专题 哲理感悟

Passage 1

（2021·山东淄博·中考真题）

Want better odds? Some people believe that finding a heads－up penny is good luck.

The odds(几率) that a found penny will be heads up are one in two.

Good－luck seekers(探求者) can also break a wishbone. Two people hold a

wishbone(如愿骨), make a wish, then break it. It is said that the person who gels the bigger

piece will get his or her wish. The odds of getting the bigger piece are one in two.

According to Irish tradition, finding a four－leaf clover(三叶草) will bring you good

luck. But just how hard is it to find one? For every ten thousand clovers you look at, the odds

are that one of them will have four leaves instead of three.

When I was a kid, I once found a four－leaf clover in our backyard. I knew that four－leaf clovers are rare(稀有的), but I didn’t know how “lucky” I was to find one until I read

(英语)中考英语冠词专题训练答案含解析

(英语)中考英语冠词专题训练答案含解析

（英语）中考英语冠词专题训练答案含解析

一、初中英语冠词

1．Don't tell a lie. You are __________ honest boy.

A. a B. an C. the D. /

【答案】 B

【解析】【分析】句意：不要说谎，你是一个诚实的男孩。boy，男孩，可数名词单数，前面加冠词a/an，表示数量“一"，honest，诚实的，音标是[ˈɒnɪst]，以元音音素开头，因此前面用an，故选B。

【点评】此题考查不定冠词用法。

2．We usually go swimming in _____summer. But in ______summer of 2018, we didn't.

A. /; / B. a; a C. /; the D. a; /

【答案】 C

【解析】【分析】句意：我们通常在夏天去游泳。但是2018年的夏天，我们没去。第一空泛指夏天，不加冠词；第二空特指2018年的夏天，用the。故选C。

【点评】考查冠词的用法。

3．—He is planning to walk on the wings of the a flying plane.

—What? I have never heard of ______idea before.