高中英語必修三第四單元重點 (2)

1、-高中英語必修三第四單元重點、難點1 、 They were followed in time by land animals. in time 及時；終于A stitch in time saves nine.小洞不補，大洞尺五。易混辨析：in time和 on timein time聯(lián)想擴(kuò)展：in no time立即；馬at one time上from time to time有時Unit Four Astronomy: the science of the stars陸地動物及時出現(xiàn)。You will get used to it intime.最終你會習(xí)慣的。表示 及時；終于；而 on

2、 time表示 按時 。曾經(jīng)；一度at a time一次at any time在任何時候at times有時；偶爾即時活用： How often do you go to see your parents? - _.A. In no time B. After a while C. In a short time D. From time to time答案： D2 、 They produced young generally bylaying eggs.它們以產(chǎn)蛋的方式生產(chǎn)后代。How many eggs does you hen lay every你的母雞每周下多少week?lay eg

3、gs 下蛋蛋？聯(lián)想擴(kuò)展： lay the table擺桌子 lay up儲存；擱置lay over推遲 lay the blame on責(zé)怪 lay thefoundation奠定基礎(chǔ)lay to 歸咎于 lay open攤開；揭 lay out擺開；展示lay aside放在一邊；lay down放下；放lay for 等露積蓄棄候3 、 These animals were different from all life forms in the past, because they gave birth to young babyanimals and produced milk to

4、feed them.這些動物和以前的任何生物形式都不同，因為它們產(chǎn)仔并用奶水喂養(yǎng)它們。give birth to生? 產(chǎn)；產(chǎn)生She gave birth to a healthy baby last night.昨晚她生了一個健康的嬰兒。That century gave birth to many great men.那個世紀(jì)產(chǎn)生了許多偉人。4 、 These animals were different from all life forms in the past, because they gave birth to young babyanimals and produced mi

5、lk to feed them.這些動物和以前的任何生物形式都不同，因為它們產(chǎn)仔并用奶水喂養(yǎng)它們。feed vt.用法歸納：（ 1 ）飼養(yǎng)If I am laid-off, I will feed some pigs.如果下崗，我就養(yǎng)豬。Do you feed any pets at home?你在家養(yǎng)寵物嗎？特別提示：feed作 飼養(yǎng) 講時，等于raise 和 keep 。（ 2 ）喂養(yǎng)We feed grass to sheep.我們給羊喂草。We feed sheep with grass.我們用草喂羊。特別提示：注意 feed 當(dāng) 喂養(yǎng) 講時動物和飼料的前后順序關(guān)系以及不同介詞的用法。

6、即時活用：1 、 He_ a lot of chicken_ his farm.A. rises; in B. keeps; on C. raises; in D. supports; on2 、 I have a very bad cold.- Well, have you ever heard of a saying which goes _ a cold and starve afeverA. feeding B. to feed C. fed D. feed答案： BD5 、 Finally about 2.6 million years ago some small clever a

7、nimals, now with hands and feet, appeared and spread all over theworld.最后大約在兩百六十萬年前，一些有手有腳的小型聰明動物出現(xiàn)了，并且擴(kuò)散到世界各地。spread v.用法歸納：（ 1 ）傳播；傳開（vi.） Bad news spreads quickly.壞消息傳的很快。Word spread that there was a variant virus of H1N1.消息稱 H1N1病毒已經(jīng)產(chǎn)生變異。（ 2 ）鋪開；展開(vt.) The bird spread its wings and was about to

8、 fly.鳥伸開翅膀準(zhǔn)備要飛。She spread a new sheet over the bed.她給床上鋪了一個新床單。（ 3 ）涂；抹 (vt.)Please spread the paint evenly.把油漆抹均勻。It s better for you to spread the honey on the bread你 .最好把蜂蜜抹在面包上。-（ 4 ）伸展；延伸（vi. ）Xi an is spreading to the north and the west.西安正在向北向西延伸。The forest spreads from here to the foot of Qi

9、nling mountains.森林從這兒延伸到秦嶺山腳下。聯(lián)想擴(kuò)展：spread out伸開；散開；鋪開spread over覆蓋一片；持續(xù)spread with在 ?上涂抹即時活用：Soon the news _ across the whole country, _the people.A. spread; exciting B. spread; excited C. was spread; excited D. was spread; exciting答案： A6 、 Thus, in their turn, become the most important animals on t

10、he planet.這樣，輪到它們成為這個星球最重要的動物。-in one s ntur輪到某人；接著Please get on the bus in your turn.該你上車了。聯(lián)想擴(kuò)展： at every turn 事事；經(jīng)常 by turns 輪流 go for a turn 散步；除去兜風(fēng) on the turn 在變質(zhì) out of turn 不合時宜的 take a turn 轉(zhuǎn)彎 take turns 輪流 to a turn 恰好7 、 They are putting too much carbon dioxide into the atmosphere, which p

11、revents heat from escaping from the earth intospace.它們向大氣層排放大量的二氧化碳，這阻止熱量向外層空間釋放。prevent? from doing防止/ 阻止?發(fā)生We must prevent the news from spreading.我們應(yīng)該阻止這個消息的傳播。Nothing can prevent him from going away.什么也不能阻止他離開。特別提示： (1)這個句型中prevent還可以被stop 或 keep 替代。 (2) 主動句中，prevent 和 stop后面的from可以省略，keep后的 fro

12、m不能省略；被動句中三個詞后的from都不能省略。聯(lián)想擴(kuò)展： prevent vt.防止；預(yù)防；阻止（ 1 ） 跟名詞或代詞Man is finding ways to prevent natural disasters.人類正在尋找預(yù)防自然災(zāi)害的辦法。 Vitamin C is supposed to prevent colds.據(jù)認(rèn)為維生素 C能預(yù)防感冒。（ 2 ）跟動名詞Teachers now have no ways to prevent students listening to老 MP3 師們 in 現(xiàn) class 在沒辦 .法阻止學(xué)生們上課聽MP3 。H1N1 flu prev

13、ented his coming to school.甲流使他不能來上課。（ 3 ） prevention n.預(yù)防；防止（ 4 ） preventive adj.預(yù)防性的即時活用： 1 、 We should do what we can to _ the Changjiang River_.A. stop; from polluting B. keep; from being polluted C. prevent; from polluting D. keep; being polluting2 、 Nobody can stop the naughty boy _.A. from pu

14、nishing B. being punishing C. from being punished D. to bepunished3 、 The heavy rain _ us starting out on time. A. kept B. prevented C. protected D. was stopped4 、 It seems very difficult _.A. to stop the child to cry B. restraining the child to cryC. to keep thechild from crying D. holding the chil

15、dying s cr答案： BCBC8 、 So whether life will continue on the earth for millions of years to come will depend on whether thisproblem can be solved.所以，在未來幾百萬年時間里生命能否在地球上延續(xù)取決與這個問題能否得到解決。depend vi.用法歸納：（1）依靠We students are depending on our parents now.我們學(xué)生現(xiàn)在在依靠父母。The town depends entirely upon tourism.這個小

16、鎮(zhèn)主要依靠旅游。（ 2 ）依賴；指望I mainly depended on his helping, but he didn我主要 t 指 turn 望他 up 幫. 忙，但是他沒來。There was no bus now, so we had to depend on our legs.現(xiàn)在沒有班車了，我們只有指望雙腿了。（ 3 ）由 . 決定 ; 取決于 Whether we will hold the sports meeting depends on the weather.我們是否舉行運動會取決于天氣。The price depends on the quality.價格取決于質(zhì)

17、量。特別提示：on 或 upon 。depend 是不及物動詞，后面一般要跟聯(lián) 想 擴(kuò) 展 ：It / That (all) depends.視情況而定即時活用：1 、 I m planning to hold a party in the open air, but I can make no guarantees because it _ the weather.A. links with B. depends on C. connects to D. decides on-2 、 The meaning of the word is various _different situatio

18、n. A. depends on B. depending C. depending on D.depended on3 、 Will you go with us to the National Park? - Well, it _. A. depending B. depends C. depends on D. isdepended4 、 How wide is the Yellow River? That _ from where to where. A. depends B.changes C. refers D. lies答案： BCBA9 、 As a result of thi

19、s event, a great dust cloud formed in the sky blocking out the sunlight.這個事件的結(jié)果就是，天空形成了一團(tuán)團(tuán)的灰塵，遮蔽了陽光。-block out vt.封閉；遮擋That wall blocks out all the light.那堵墻把光都遮住了。Block out the unimportant part on the picture.把照片上不重要的部分遮住。聯(lián)想擴(kuò)展：block vt.（ 1 ）堵??；阻塞A big stone has fallen from the mountain and blocked

20、the road.一個大石頭從山上掉下來阻塞了道路。The pipe of heat must be blocked up.暖氣管子肯定是堵住了。（ 2 ）阻礙；阻擋The wet weather blocked our plan for a trip.下雨阻礙了我們的出行計劃。The other player tried to block my advance, but he failed.另一個球員試圖阻擋我前進(jìn)，但是沒檔住。10 、 Then we were off.然后我們就出發(fā)。off(1) ( 和某些動詞連用 ) ? 開； ? 掉The bird flew off.鳥飛走了。I m

21、ust dash off.我必須馬上離開。(2)（作表語）走掉；動身走Are you really off?你真要走嗎？I must be off now.我必須要(3)（和某些動詞連用）? 下去Cut the end off.把頭切掉。走。(4) 距離多遠(yuǎn)（時間；空間）Mind you don t fall off. 小心別掉下去。Summer is only a week off.再有一個星期就到夏天了。They live two blocks off.他們離我們只有兩個街區(qū)。(5)不工作；休息The manager gave the staff a day off.經(jīng)理讓員工休息一天。I

22、f you finish your work today, you can have tomorrow off.如果你今天做完工作，我就讓你明天休息一天。11 、 I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earthbecome smaller and the moon larger.我立刻感到高興，由于失重我在太空艙里飄來飄去，我望著身后的地球越來越小，而前方的月球越來越大。cheer up感到高興；感到振奮Cheer up! Things are

23、not so bad as they seem.別泄氣，事情不像看起來那么糟。The good news has cheeredhim up.12 、 If you are right, my mass will be less than on the earth because the moon is smaller and I will be ableto move more freely.如果你正確，我的體重要比在地球上小，因為月球比地球小，這樣我就能更自如活動了。mass n. 一堆；一塊；一團(tuán)In cold winter, the pond will become a solid m

24、ass of ice.寒冷的冬天，池塘?xí)兂梢粔K堅硬的冰。I found a mass of concrete on the bed.我在床上發(fā)現(xiàn)了一塊水泥。聯(lián)想擴(kuò)展：（ 1 ） a mass of = masses of大量的；許多After harvest, we will have a mass of rice.收獲以后，我們會有大量的水稻。I have masses of work to do today.特別提示 ：a mass of = masses of表示 大量的；許多時，既可修飾可數(shù)名詞，也可修飾不可數(shù)名詞。（ 2 ） the masses群眾The masses are t

25、he true makers of history.人民群眾是歷史的真正締造者。The party should rely on the masses.黨應(yīng)該依靠群眾。（ 3 ） in the mass一般來說The work is well done in the mass.大體上說工作做得不錯。13 、 Walking does need a bit of practice now that gravity has changed.由于引力變化了，步行都需要練習(xí)。now that既然Now that you have arrived, let s start the既 meeting然你們

26、到 .了，我們開會吧。-14 、 After a while I got the hang of it and we began to enjoy ourselves.過了一會兒我就理解了，我們就開始盡情的玩耍。get / have the hang of學(xué)會使用；懂得I can t get the hang of his speech我 . 們有弄懂他講演的意思。The new machine is very easy to operate, you will soon get the hang of it.聯(lián)想擴(kuò)展：give a hang about對 ? 有興趣I don t give

27、a hang about pop music.我對流行音樂沒興趣。-15 、 We watched, amazed as fire broke out on the outside of the spaceship as the earth s gravity increased.我們驚奇的看著，隨著地球引力的增加，宇宙飛船的外層燃燒起火。break out用法歸納：（1）爆發(fā)The economic crisis broke out first in the United States.經(jīng)濟(jì)危機(jī)首先在美國爆發(fā)。The First World War broke out in 1914.第一次世界大戰(zhàn)在1914年爆發(fā)。（ 2 ）突然發(fā)生Flu usually breaks out in winter.流感一般發(fā)生在冬季。A big fire broke out in the factory last night.昨晚工廠發(fā)生大火。（ 3 ）突然大聲People listening to the joke broke out laughing.聽笑話的人突然大笑起來。聯(lián)想擴(kuò)展：break? up 結(jié)束；拆開break down出故障；失敗；身體垮了break? down打