How long could you stand on Antarctic ice before your bare feet froze solid? A minute. Maybe two? If you’re an emperor penguin, you can do it for two months in cruel winds at as low as-75 degrees Fahrenheit1., but their special circulation acts as a kind of antifreeze to keep them warm enough.
Penguin legs and feet have evolved to lose as little heat as possible. Penguin feet preserve heat by restricting blood flow in really cold weather, keeping foot temperature just above freezing2.
Blood vessels to and from the feet are very narrow and woven closely together, cooling the blood from the body on the way to the feet and heating the blood as it returns to the body.3. .
This special ability is part of how penguins keep their eggs warm until they hatch. Each penguin egg’s father balances it on his feet and covers it with his very warm layer of feathered skin to keep it cozy while females are out feeding at sea.4.. If females haven’t returned with food by time the chicks hatch, male penguins feed their babies for a few days on a kind of "milk" made from special cells inside their throats.
5.Your hands get whiter during freezing weather because there 's less blood in them which has been redirected to the central part of your body to make sure vital organs stay warm.
A. Penguin legs work like a heat exchange system
B. Those naked bird feet may look extremely cold
C. Therefore, the male penguins must stay together in groups
D. However, parenting doesn't stop there for these devoted fathers
E. Emperor penguins also have the ability to 'recycle’ their own body heat
F. Feet get cool blood so there’s less heat to lose, while the body stays warm and comfortable
G. In fact. humans have the ability to restrict blood flow to their hands and feet in cold weather too
高三英语七选五简单题
How long could you stand on Antarctic ice before your bare feet froze solid? A minute. Maybe two? If you’re an emperor penguin, you can do it for two months in cruel winds at as low as-75 degrees Fahrenheit1., but their special circulation acts as a kind of antifreeze to keep them warm enough.
Penguin legs and feet have evolved to lose as little heat as possible. Penguin feet preserve heat by restricting blood flow in really cold weather, keeping foot temperature just above freezing2.
Blood vessels to and from the feet are very narrow and woven closely together, cooling the blood from the body on the way to the feet and heating the blood as it returns to the body.3. .
This special ability is part of how penguins keep their eggs warm until they hatch. Each penguin egg’s father balances it on his feet and covers it with his very warm layer of feathered skin to keep it cozy while females are out feeding at sea.4.. If females haven’t returned with food by time the chicks hatch, male penguins feed their babies for a few days on a kind of "milk" made from special cells inside their throats.
5.Your hands get whiter during freezing weather because there 's less blood in them which has been redirected to the central part of your body to make sure vital organs stay warm.
A. Penguin legs work like a heat exchange system
B. Those naked bird feet may look extremely cold
C. Therefore, the male penguins must stay together in groups
D. However, parenting doesn't stop there for these devoted fathers
E. Emperor penguins also have the ability to 'recycle’ their own body heat
F. Feet get cool blood so there’s less heat to lose, while the body stays warm and comfortable
G. In fact. humans have the ability to restrict blood flow to their hands and feet in cold weather too
高三英语七选五简单题查看答案及解析
How long do you believe it will be _____ Chinese people land on the moon?
A．before B．since C．when D．that
高三英语单项填空中等难度题查看答案及解析
How long do you believe it will be _____ Chinese people land on the moon?
A．before B．since C．when D．that
高三英语单项填空中等难度题查看答案及解析
—Do you think I could borrow your bicycle?
—
A.How come? B.Take your time. C.Yes,go on. D.Yes,help yourself.
高三英语单项填空中等难度题查看答案及解析
How come you stepped into the lab with your shoes on? You’re ________to take them off before you enter it. I told you so.
A.suggested B.supposed C.forbidden D.permitted
高三英语单项填空中等难度题查看答案及解析
— Do you think I could borrow your bicycle? -- ______.
A. How come? B. Take your time. C. Yes, go on. D. Yes, help yourself.
高三英语单项填空中等难度题查看答案及解析
---- Do you think I could borrow your MP4?
---- ________
A．How come? B．Take your time.
C．Yes，go on. D．Yes，help yourself.
高三英语单项填空简单题查看答案及解析
Beginning to learn gymnastics even before she could barely walk, Svetlana had always dreamed to enter the Olympics scene some day.
However, her ended in the car on the winding road when a lorry appeared out of nowhere. The last thing she was a blinding flash of light. In hospital, when told she would never again, she couldn’ t believe it. Three months later, she was out of hospital on a wheelchair. Then a friend came to her house to visit her with an old child’ s storybook. A bookmark in it made her to page 117. The name of the was‘The Day Clara Walked’ . She was determined to return to stage whatever it might cost.
, after a year’ s hard exercise, Svetlana recovered and was able to display her gymnastics. While she was sitting on the green bench the Athens Stadium, memories : first, the pain and the tears, the book under her pillow, the words of relatives full of advice and comfort, and the pity in those eyes that had once held for her talent. Then followed the trips to the gym where everyone looked on , their disbelief transforming slowly to wonder, she could balance the hoop（健身圈）as well as her teammates. She registered for 2004 Olympic Games, and finally she received from the Olympic Committee.
Her was interrupted by the attendant who said,“It’ s time” , two words that she had been to hear for so long. Smoothing her dress, she walked into the stadium, each firm and steady. Everything was , and the applause rang loud in her ears, her heart violently against her chest.
Later that night, Svetlana pulled the gold medal out of her pocket and placed it on the old on the shelf, which opened to page 117, to the chapter‘The Day Clara Walked’ , tears her vision.
1.A. dream B. intension C. life D. career
2.A. forgot B. remembered C. experienced D. suffered
3.A. see B. dance C. walk D. sing
4.A. rushed B. rocked C. thrown D. wheeled
5.A. open B. relate C. point D. adapt
6.A. bookmark B. page C. chapter D. story
7.A. Suddenly B. Surprisingly C. Fortunately D. Certainly
8.A. opposite B. beneath C. inside D. outside
9.A. flooded in B. faded away C. mixed up D. squeezed out
10.A. fright B. regret C. sympathy D. admiration
11.A. doubtfully B. thankfully C. nervously D. cheerfully
12.A. until B. as C. while D. once
13.A. access B. praise C. support D. approval
14.A. plan B. attempt C. thought D. sight
15.A. content B. eager C. upset D. proud
16.A. breath B. wake C. step D. look
17.A. unexpected B. awful C. perfect D. finished
18.A. fighting B. striking C. kicking D. hammering
19.A. hoop B. book C. letter D. dress
20.A. clouding B. filling C. rolling D. Rushing
高三英语完形填空中等难度题查看答案及解析
完形填空
Beginning to learn gymnastics even before she could barely walk, Svetlana had always dreamed to enter the Olympics scene some day.
However, her ________ ended in the car on the winding road when a lorry appeared out of nowhere. The last thing she ________ was a blinding flash of light. In hospital, when told she would never ________ again, she couldn't believe it. Three months later, she was ________ out of hospital on a wheelchair. Then a friend came to her house to visit her with an old children's storybook. A bookmark in it made her________ to page 117. The name of the _________ was ‘The Day Clara Walked’. She was determined to return to stage whatever it might cost.
_________， after a year's hard exercise, Svetlana recovered and was able to display her gymnastics. While she was sitting on the green bench ________ the Athens Olympic Stadium, memories _________： first, the pain and the tears, the book under her pillow, the words of relatives full of advice and comfort, and the pity in those eyes that had once held _________ for her talent. Then followed the trips to the gym where everyone looked on ________， their disbelief transforming slowly to wonder, ________ she could balance the hoop (圈) as well as her teammates. She registered for the 2004 Olympic Games, and finally she received _________ from the Olympic Committee.
Her _________ was interrupted by the attendant who said, “It's time”， two words that she had been ________ to hear for so long. Smoothing her dress, she walked into the stadium, each ________ firm and steady. Everything was ________， and the applause rang loud in her ears, her heart beating ________ in her chest.
Later that night, Svetlana pulled the gold medal out of her pocket and placed it on the old ________on the shelf, which opened to page 117, to the chapter ‘The Day Clara Walked’， tears ________ her vision.
1.A.intention B．dream C．life D．career
2.A.remembered B．forgot C．experienced D．suffered
3.A.see B．dance C．sing D．walk
4.A.wheeled B．rocked C．thrown D．rushed
5.A.point B．relate C．open D．adapt
6.A.bookmark B．page C．story D．chapter
7.A.Fortunately B．Surprisingly C．Suddenly D．Certainly
8.A.outside B．inside C．beneath D．opposite
9.A.squeezed out B．faded away C．mixed up D．flooded in
10.A.fright B．admiration C．sympathy D．regret
11.A.cheerfully B．thankfully C．nervously D．doubtfully
12.A.until B．while C．as D．once
13.A.approval B．praise C．support D．access
14.A.plan B．thought C．attempt D．sight
15.A.eager B．content C．upset D．proud
16.A.breath B．wave C．step D．look
17.A.unexpected B．perfect C．awful D．finished
18.A.immediately B．swiftly C．properly D．fiercely
19.A.hoop B．letter C．book D．dress
20.A.rolling B．filling C．clouding D．rushing
高三英语完形填空中等难度题查看答案及解析
. ---Could you give me some coins, dad? I want to buy an ice cream
---Sorry, I’ve got ______ on me.
A. none B. nothing C. quite a few D. no one
高三英语单项填空简单题查看答案及解析