Unit 12 Mainly Revision(一)

Step 1 Lead – in
(Show some pictures to attract the Ss’  interests about the text.)
Step 2 Reading:

A.Ask the Ss to do some “True or False” exercises
1. Some birds will fly away to the south when the weather turns cold; some animals hibernate in the cold wather.(True)
2. Animals hibernate only in the earth. (False)
3. None of the warm-blooded animals need to hibernate because they lead an active life which keeps up their body temperature even in very cold weather. (True)
4. A hibernating animal does not breathe and cannot feel any pain. (False)
B.Questions and answers:
1. Why don’t some warm-blooded animals hibernate in the winter?
(lead an active life, keep up, body temperature)
2. Why do cold-blooded animals hibernate?
(When the air temperature, below freezing, body temperature, drop, cannot move about; almost no food in the winter)
3. How would you recognize that an animal is hibernating?
C.Reading comprehension:
1.The text mainly tells us that ________.
A .hibernation is more than sleep
B. warm-blooded animals will do things different from cold-blooded animals in winter
C. some animals live through the winter by hibernation or half-hibernation
D. animals use different ways to protect themselves against the cold    (key: C)
2. Why do some animals sleep under the snow?
A. Because they prefer the cold air in the snow.
B. Because the air in loose snow will help to keep the cold out.
C. Because they can adjust(調(diào)節(jié))their body temperature there to fit for the cold weather.
D. Because they are warm-blooded animals.  (key: B)
3. Which sentence carries the main idea of the second paragraph?
A. Sentence 1.   B. Sentence 2.   C. Sentence 3.   D. Sentence 4.    (key: A)
4. Why can the wolf keep awake in winter?
A. Because it is a cold-blooded animal.
B Because it prefers moving by nature.
C. Because it can keep up its body temperature even in cold weather.
D. Because it has to go hunting as a result of lack of food for the winter.   (key: C)
5. Why do frogs go to sleep under the mud in winter?
A. Because they can escape from their enemies under the mud and the air there will keep the cold out.
B. Because the air under the mud will keep the cold out and it is comfortable there.
C. Because they feel comfortable there and they can get food easily.
D. Because they have enough to eat there .       (key: D)
6. We will know an animal is hibernating if _______
A. it touches cold and is breathing very slowly
B. it is sensitive to pain
C. its temperature drops to below zero centigrade
D. it does not move   (key: A)
7. Why can a hibernating animal manage to live through the winter?
A. Because it hardly makes any movement and breathes very slowly and it has enough fat stored in its body.
B. Because it has already stored supplies of fat in its body.
C. Because it will not use energy while sleeping since they never make any movement then.
D. Because it doesn’t breathe at all.    (key: A)
8.Why does the bear stop hibernating on warm winter days?
A. Because the warmth makes it think the winter has gone.
B. Because it has to eat some food for the next long sleep.
C. Because it feels cold and wants to warm itself up on warm winter days.
D. Because it is going to hunt something on warm winter days.    (key: A)
9. Why does a squirrel hide nuts before the beginning of winter?
A. Because it will eat a lot in winter to keep warm.
B. Because it is hard to find food in winter.
C. Because it needs to eat a lot to hibernate.
D. Because it needs nuts to fight against its enemies.    (key: B)
10. We human beings are able to keep the cold out because ________
A. we are warm-blooded
B. we are clever enough to build houses and to wear clothes
C. we are cold-blooded, and we do not need to hibernate
D. for human beings, hibernation will use more energy    (key: A)
Step3:language points:

本單元重點(diǎn)句型
(1)Hibernation is more than sleep.
(2)People who find hibernating animals asleep often think that they are dead.
(3)You can touch it, or even pull its tail, without causing it to move or wake up.
(4)Hibernating in that way, the animals can sleep all through the winter.
(5) The second is connected with the main use the body makes of food—to supply the energy for movements.
(6) We have seen that hibernating animal reduces movements to far below the ordinary level.
(7) The animal hardly makes any movement, hardly uses any energy, and hardly needs any food.
(8)Some animals, including some bears, only half-hibernate.
難句解析：
1.They go to sleep in all kinds of places.它們到各種各樣的地方去睡覺。
go to sleep，fall asleep與sleep，這三個(gè)詞（組）都有“睡著”之意。go to sleep意思是“睡著，去睡覺”，fall asleep意思是“睡著了，酣睡”，它們都表瞬間動(dòng)作，如表持續(xù)性動(dòng)作或延續(xù)性狀態(tài)，要用動(dòng)詞sleep。e.g.
①I found it very difficult to go to sleep.我發(fā)現(xiàn)很難人睡。
②Soon he fell asleep，for he was very tired.他很累，很快就睡著了。
③we have slept(for) eight hours.我們已睡了八個(gè)小時(shí)。
2.They lead an active life which keeps up their body temperature even in very cold winter weather.
他們生活得很活躍，即使在嚴(yán)寒的冬天也能保持正常的體溫。
習(xí)慣用法
（2）keep up保持，維持，繼續(xù)，e.g.
① Let s  hope  the  sunny weather keeps up for Saturday s tennis match.
但愿星期六網(wǎng)球比賽時(shí)還是這樣的好天氣。
②We。Are having difficulty keeping up。our。mortgage payments.我們難以繼續(xù)支付分期償還的抵押貨款。
③If you want to be a performer，you 11 have to keep up your piano.如果你真想成為演奏家，就得堅(jiān)持練習(xí)鋼琴.
3.Then it as no choice but to lie down and sleep.于是，別無選擇，它們只好躺下睡覺。
have no choice but to do表“別無選擇”之意。e.g.
Have I any  choice but to do as you tell me？  除了按你吩咐的去做外，我還有別的選擇嗎？
表示“別無選擇只好做……”之意，除了可用   have no choice but to do…來表達(dá)外，還可用下列固定搭配：
（l）can do nothing but do/can not do anything but do，e.g.
I can do nothing but accept his demand.我只好接受他的要求。
（2）there is nothing left to do but do…，e.g.
There was nothing left for her to do but cry.她別無它法，只有哭。
（3）can’t but do…，e.g.
I could not but admit that he was right and。I was wrong.我不得不承認(rèn)他對(duì)了，我錯(cuò)了。
疑難點(diǎn)撥：
1.Hibernation is more than sleep.冬眠不僅僅是睡眠。
句中的more than相當(dāng)于 not only。意為“不僅僅”。e.g.
He is。more a teacher.He is a good friend of mine。他不只是老師，還是我的益友。
2.People who find hibernating animals asleep often think that they are dead..人們看到處于冬眠狀態(tài)的動(dòng)物，常常以為它們死了。
這是一個(gè)復(fù)合句。
（l）who－clause是定語從句修飾people，that－clause是賓語從句作think的賓語。
（2）asleep是表語形容詞，在句中一般只作表語，賓補(bǔ)，或后置定語，這樣的形容詞還有alive，alike，alone，awake等。
3.You can touch it, or even pull its tail without causing it to move  or wake up. 你可以摸它，甚至可以拉它的尾巴，這也不會(huì)使它動(dòng)一動(dòng)或醒過來。
這個(gè)句子可改寫成：Even if you touch it or pull its tail，you can’t cause it move or wake up.
4. Hibernating in that way, the animal can sleep all through the winter.
用那種方式冬眠，動(dòng)物可以睡過整過冬天。
句中的 hibernating in that way是現(xiàn)在分詞短語在句中作狀語，相當(dāng)于as they hibernate in that way。
5.We have seen that hibernating animal reduces movements to far below the ordinary level..
冬眠動(dòng)物的活動(dòng)量減少到遠(yuǎn)遠(yuǎn)低于一般水平。
(1)句中的 far below意為“遠(yuǎn)遠(yuǎn)低于，比……低得多”。e.g.
In winter the temperature of Harbin is far below that of Wuhan.
冬天哈爾濱的氣溫比武漢的低得多。
（2）句中的reduce..to作“減少，使處于……狀態(tài)”解。e.g.
① The house was reduced to ashes by the big fire.那場大火把屋子化為灰燼。
②The man was reduced to begging for food.那男人淪落到討飯的地步。

Step4:Fill in blanks.

1. They go to sleep in all kinds of places. Red squirrels disappear inside trees, bears use caves, frogs go deep under the mud, and many other animals dig holes in the earth .A good many animals sleep under the snow. There is a lot of air in loose snow, and this helps to keep the cold out.

2. Hibernation is more than sleep. It is a very deep sleep.the animal’s temperature drops to just over zero centigrade, and its heart beats very slowly.People who find hibernating animals asleep often think that they are dead; the body feels very cold, and the animal may breathe only once every five minutes. A hibernating animal cannot feel any pain. You can touch it , or even pull its tail, without causing it to move or wake up.

3.Hibernating in that way, the animal can sleep all through the winter. You might wonder how  it manages to live withut eating for so many months . The answer lies in two facts. The first is that it has stored supplies of fat in its body during the summer and autumn. The second is conneted with the main use the body makes of food­---- to supply the energy for movement. We have seen that the hibernating animal reduces movement to far below the ordinary level. Even the movements of the heart and lungs are greatly reduced.The animal hardly makes any movement,hardly uses any energy, and hardly needs any food.

Step5:Homework:Write a summary of the test.