2.(08·重慶理綜·17)下列與能量有關的說法正確的是　　　　 (　　 )　　　　　　

A.衛(wèi)星繞地球做圓周運動的半徑越大,動能越大

B.從同種金屬逸出的光電子的最大初動能隨照射光波長的減小而增大

C.做平拋運動的物體在任意相等時間內(nèi)動能的增量相同

D.在靜電場中,電場線越密的地方正電荷的電勢能一定越高

答案　 B?

解析　 衛(wèi)星繞地球做圓周運動的向心力由衛(wèi)星與地球之間的萬有引力提供,即,由此式可得,故r越大,衛(wèi)星動能越小,故A錯.光電子的最大初動能,故隨波長的減小而增大,B對.

在平拋運動的過程中t時刻后任取一小段時間為Δt,故t時刻豎直方向的分速度為v_t,t+Δt時刻豎直方向的分速度為v_t+Δt,其動能增量為,化簡可得:

,

由此可知,就算Δt相同,ΔE_K仍隨t的增大而增大,故C錯.如正電荷處于負電荷產(chǎn)生的電場中,電場線越密的地方,正電荷的電勢能越低,故D錯.

兩年高考·精選(2008-2009)

考點1 基本概念的理解

1. (09·廣東文科基礎·58) 如圖8所示，用一輕繩系一小球懸于O點�，F(xiàn)將小球拉至水　 平位置，然后釋放，不計阻力。小球下落到最低點的過程中，下列表述正確的是　　　　 (　 A　 )

A．小球的機械能守恒

B．小球所受的合力不變

C．小球的動能不斷減小

D．小球的重力勢能增加

5．句子翻譯

1)　　 慢一點！我跟不上你。(pace)

2)　　 這位運動員把成功歸功于他的教練。(owe)

3)　　 你昨晚不應該熬夜。(ought)

4)　　 他在夢中想到了這個主意。(occur)

5)　　 昨天我要是乘出租車去就好了。(only)

6)　　 他獨立完成了這項工作。(own)

7)　　 所有公民都必須遵守法律。(obey)

8)　　 我還沒有收拾行李。(pack)

9)　　 Tom不會游泳，我也不會。(nor)

10) 我沒有注意到他離開辦公室。(notice)

4．選詞填空

order　 overweight　　 opposite　 outgoing　 oppose　 outline　　 optional　　 nowadays　 observe　 otherwise

1)　　　　 Most people _______ are aware of the importance of a healthy diet.

2)　　　　 One student performs the experiment, while his partner__________.

3)　　　　 Most bosses are ________ to employees working overtime. They don’t think it’s a good idea.

4)　　　　 I thought the medicine would make him sleep, but it had the _________ effect.

5)　　　　 Jamie is friendly, ____________ woman; she likes to meet and talk to new people.

6)　　　　 You’ll have to go now, ______________, you’ll miss your bus.

7)　　　　 He sat down at a table near the window and __________ a meal.

8)　　　　 The doctor said I was slightly _______ and that I needed more exercise.

9)　　　　 Write a short _________ covering the main points before you start on your essay.

10)　　 You don’t have to do the course --- it’s ___________.

3．單項選擇

1) --- Have you got a camera?　 --- No. I should buy ________.

　 A. it　　　　 B. any　　　　 C. one　　　 D. some

2) I know what people are saying --- but _______ of it is true.

　 A. none　　 B. no one　　 C. one　　 D. all

3) It’s ______ to feel nervous before an exam.

　 A. ordinary　 B. common　　 C. normal　　 D. usual

4) She’d looked everywhere for her glasses, but hey were ______________.

　 A. nowhere found　　 B. to find nowhere　　 C. nowhere to find　 D. nowhere to be found.

5) Dad loves fishing best; the hobby ________ most of his spare time.

　 A. observes　　 B. occupies　　 C. costs　　 D. spends

6) Doctors believe only _________ tiny number of people _______ at risk.

　 A. a; is　　 B. a; are　　 C. the; is　　 D. the; are

7) I can’t do everything ___________ --- You’ll have to be patient.

　 A. all at once　　 B. just for once　　 C. once more　 D. once upon a time.

8) I arrived only _______ that the others had already left.

　 A. found　 B. finding　 C. to find　 D. having found

9) The government ordered that for every tree cut down, two more _______ planted.

　 A. could be　 B. be　　 C. were　　 D. to be

10) _____________ a lack of funds, the project will not continue next year.

　 A. Because　　 B. As a result　　 C. According to　　 D. Owing to

2．介詞填空

1)　　　　 Dave made a note ____________ her address and phone number.

2)　　　　 The hotel lies on a island _________ the coast of France.

3)　　　　 Are you doing anything special ______________ Saturday night?

4)　　　　 I don’t like it when the cat jumps ___________ my lap.

5)　　　　 They said they had cleaned up but there were beer bottles all ___________ the place.

6)　　　　 --- What’s your opinion ________ Cathy?　 ---- She’s very lovely.

7)　　　　 Ann may be ________ her forties, but she looks very young.

8)　　　　 Doctors had to operate __________ his knee immediately.

9)　　　　 The boss is occupied ________ his business and has no time with his family.

10)　　 It is obvious ____________ everyone that the pet has been badly treated.

1.單詞聽寫

1)　　　　 A n________ family usually consists of a husband, a wife and their children.

2)　　　　 UFO stands for unidentified flying o_________.

3)　　　　 The Pacific O__________ covers one-third of the Earth’s surface.

4)　　　　 English is the major o___________ language of the USA.

5)　　　　 The manager is o_____________ and believes good things will happen in the future.

6)　　　　 Would you prefer rice or n_______________ ()?

7)　　　　 O____________ is necessary for most animals and plants to live.

8)　　　　 He had put on his o___________ () and was pulling the collar up over his ears.

9)　　　　 With China’s entry into t he World Trade O_____________ (), more foreigners are coming to Beijing to work, study and live.

10)　　 A large p_______________() has arrived for you.

5．句子翻譯

1)　 他對考試如此緊張而不能入睡。(nervous)

2)　 在現(xiàn)代社會，掌握英語很有必要。(necessary)

3)　 Tom， 你一定誤解我了。(misunderstand)

4)　 你介意離家這么久嗎？(mind)

5)　 油不容于水。(mix)

6)　 觀眾被這部電影深深打動了。(move)

7)　 你是哪一個國家的？(nationality)

8)　 你當時沒有必要急匆匆的。(need)

9)　 被謀殺的女人在這個地區(qū)很有名氣。(murder)

10)　　　　　　　 有消息傳來說他出了車禍。(news)

高三英語核心詞匯復習第16課時

(nod– pair)

4．選詞填空

nature　 motto　 minus　 necessary　 model　 miss　 mild　 modest　 murder　 network

1) A _________ of veins(動脈) and arteries(靜脈) carries the blood around the body.

2) I’ll stay up all night, if _________ to get the job finished.

3) She is by ________ a very kind person. We all like her character.

4) The Olympic __________ is “Swifter, Higher, Stronger”.

5) 17 __________ 5 is 12.

6) The hotel is on the corner; it is very easy to notice or recognize. You can’t _________ it.

7) We had a ___________ winter last year. It wasn’t that cold.

8) Jason, an Olympic champion, is __________ about his achievement.

9) Wilson is accused of __________ the millionaire.

10) Chris always got to work early and left late --- He is a _________ employee.

3．單項選擇

1) He doesn’t seem to get the message __________ he’s not welcome here .

　 A. which　　　　 B. what　　　　 C. whose　　　　 D. that

2) Don’t your parents mind _____________ out so late?

　 A. you stay　　　 B. you staying　 C. you’re staying　 D. you to stay

3) The soldier was lucky, the bullet narrowly ____________ her heart.

　 A. avoided　　 B. left　　 C. missed　　 D. moved

4) A woman _______ him _______ a well-known actor, and asked him for his autograph(簽名).

　 A. mistook … for　 B. mixed … for　 C. mistook … with　 D. mixed … with

5) _________ she entered the room, she knew there was something wrong.

　 A. At once　　 B. The moment　 C. In a minute　 D. The time

6) The engine will need ____________.

　 A. complete checking　　 B. being checked completely

　 C. to check completely　　　 D. to be completely checked

7) The street is named _________ the famous South African leader, Nelson Mandela.

　 A. with　　 B. by　　 C. after　　 D. like

8) Thompson had two plans, _______ seems to have worked very well.

　 A. both of them　　 B. neither of them　　 C. both of which　 D. neither of which

9) I learned ___________ nothing at school --- the teachers were awful.

　 A. next to　 B. close to　　 C. nearby　　 D. beside

10) For the spoken language, students are taught by __________ speakers.

　 A. national　　 B. native　　 C. natural　 D. narrow