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depends on getting oxygen from water through parts of its body.
However,birds' respiration (呼吸) is different from that of dogs and is much more efficient
than that of other animals.The lungs take up just 2 percent of a bird's body volume,yet the bird
quickly takesin large amounts of oxygen and quickly removes waste and excess heat.
There are actually two respiration systems,internal and external.
The external respiration system uses the lungs and a series of air sacs (袋囊) distributed
throughout the body so that the oxygen supply is in direct communication with body parts.Oxygen
is taken in and exchanged for carbon dioxide in the blood,then the carbon dioxide is moved out.
So far,much like dogs.
However,in an important difference,the air flow in a bird is one way,through a series of tubes
and cells,rather than two ways,in and out of the lungs,as it is in dogs.A constant stream of air goes
through lungs and then is channeled through the complex system of air sacs,which also help remove
excess heat,as wellas through hollow bones.The gases are then channeled forward through the lungs
again,then through more air sacs,finally ending up in the windpipe,and are expelled from the body.
The air sac system is bigger than the lungs and takes up 15 percent of the chest and belly area.
Meanwhile,the birds' great oxygen needs are also handled by the internal breathing system.
The oxygen,stored primarily in body fat tissue,is burned through the process of cell respiration.
This process produces both muscular energy and heat.
So far much ______ stop pollution.
[ ]
A. do to B. was done to C. has done to D. has been done to
查看习题详情和答案>>On this happy occasion, I'd like to say that we are _____ much obliged to you for your kind cooperation.
A. even so B. ever so C. as yet D. so far
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第三部分:阅读理解(共20小题,每小题2,满分40分)
A
When he thought of the past,my grandfather would sometimes show us photographs of himself at school. They were brown and faded,and it was hard to believe that the blurred figure of the little boy in the short trousers and socks could ever have been Grandfather. Besides,he wore a cap---andthe boys in the photographs wore caps pulled so far forward that half of their faces were obscured. When Grandfather asked us to pick him out from the group,we would surely point to the wrong boy.
On one such occasion my younger sister,aged six,burst into tears when Grandfather proudly guided her finger to the right boy. "How could that boy be you?"she cried. "He should have a beard.” We were,of course,all convinced that grandfathers should have beards ,preferably white and bushy,like our owngrandfather's.
"I wasa good scholar ,”Grandfather would say,wagging his beard over the photographs."I should have been top of the c1ass if I hadn't had to get up at six every morning to milk the cows and chop the wood,and again when I came home from school.”
"But Saturdays?What did you do on Saturdays?"
"Saturdays,if it was fine, I’d be out all day in the fields with the men,"replied Grandfather."And if it was wet,I’d be helping my mother with odd jobs round the house.There wasn't much time for studying."
We all tried hard to imagine what it would have been like to have been Grandfather getting up at crack of dawn and never,obviously,having amoment for himself.It seemed we had learnt something from what Grandfather had said about his childhood.
56.In the first paragraph of this passage,what theauthor really tells us is that_______.
A.his grandfather used to wear short trousers,socks and a cap as well
B.it was difficult to tell which of the boys inthe photographs was Grandfather
C.he didn't believe Grandfather wore a cap pulled forward when he was at school
D.it was fun to watch boys in the photographs wearing caps pulled forward
57. The author's sister burst into tears because________.
A.she did not get a chance to pick outGrandfather in the photographs
B.she was told which was the right boybefore she herself could pick him out
C.other children did not agree with her thatGrandfather should have had a beard
D.she found Grandfather in the photographsdid not have a beard
58.When Grandfather said,"I should have been topof the class….",he meant________.
A if he had had more time for studying,hewould have been the best in his class
B.he should have spent more time studyingrather than playing ballgames
C.his school days should not have been so hard and miserable
D.he could have never been the best studenteven if he had studied still harder
59. In the last paragraph the author said,"We all tried hard to imagine…"because________.
A. the figures of the boys in the photographswere small and blurred
B. the children had never experiencedlife like that of Grandfather
C.the photographs Grandfather showed them were brown and faded
D.Grandfather failed to tell them about his childhood in detail
A man was driving at 70 miles in a 40-mile zone(区域), when a 36 came behind him. Right away the man started thinking of 37 to give.
As the policeman came to him, he said, “Hi, officer, I guess you 38 me a little bit over the speed limit(限制). I was in a rush to get 39 , to be with my wife and kids. You know my younger son wasn’t feeling too 40 when I left home this morning. I’m afraid he’s ill.”
The policeman said, “Well, I guess so,” and started 41 something in his notebook. As minutes went by, he could see from the side view mirror, the policeman was 42 writing. When the man was wondering why he hadn’t asked for his driving 43 so far, the policeman came to his window, 44 him a piece of paper, and returned to his car without saying a single word. The man wondered: how much was this 45 going to be? However, the man was 46 it was not a ticket at all and he began to 47 :
“I had a daughter who was 48 by a speeding car at the age of six by a speeding driver. He got a fine, a few months in 49 , and then was free, free to hug(拥抱) his two daughters. I only had one, and now I have to 50 until I get to heaven before I can hug her again. I have tried to 51 that man a thousand times, and I thought I had. Maybe I really did forgive (原谅) him. So pray (祈祷) for me, and be 52 when you drive again. My son is all I have been left with.”
The man was completely 53 and could not move for the next few minutes. When finally he did, he drove 54 , even a few miles 55 the speed limit, praying for forgiveness.
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