Giraffes have (eyes) that allow them (seeing) in all directions without (twisting) their (
Giraffes have (eyes) that allow them (seeing) in all directions without (twisting) their (heads).
A.eyes
B.seeing
C.twisting
D.heads
Giraffes have (eyes) that allow them (seeing) in all directions without (twisting) their (heads).
A.eyes
B.seeing
C.twisting
D.heads
Biologists have known for some time that giraffes solve this problem by having unusually high blood pressure, about double that of human beings. But an international team of biologists began to wonder about this. If giraffes have such high blood pressure, they should have a terrible problem with swelling in their legs and feet. Why don't giraffes have swollen feet?
Giraffes should have another problem, too. Every time they bend heads down to drink, the blood should rush to their heads and have a hard time flowing back up (when the head is down)to the heart. How come giraffes don't black out when they drink?
The answer to the swollen feet problem, the researchers found, is that giraffes have what the researchers call a "natural anti-gravity suit". It turns out that the skin and other tissues in their legs and feet are much stiffer and tougher than those of other animals. As a result, the blood vessels in the leg cannot swell. Therefore, the blood has nowhere to go but back to the heart.
What about blood rushing to the head whenever the giraffe bends down to drink? The researchers found that the giraffe's jugular vein, which carries blood from the head back to the heart, has lots of one-way valves in it. In the giraffe's neck, there are lots of muscles that flex and relax repeatedly as the animal moves its head and sucks up drinking water. By squeezing the valved jugular vein, they keep blood moving back to the heart even while the animal is drinking.
Giraffes do not have swollen legs because______.
A.their legs and feet have strong skin and muscles
B.their blood vessels are stiff and tough legs
C.they wear a kind of special suit
D.there are lots of one-way valves in the veins of their legs
Biologists have known for some time that giraffes solve this problem by having 【C3】______ high blood pressure, about 【C4】______ that of human beings. But an international team of biologists began to 【C5】______ about this. If giraffes have such high blood pressure, they should have a 【C6】______ problem with swelling in their legs and feet. Why don't giraffes have swollen feet?
Giraffes should have 【C7】______ problem, too. Every time they bend heads 【C8】______ to drink, the blood should 【C9】______ to their heads and have a hard time 【C10】______ back up (when the head is down) to the heart. How come giraffes don't black out when they drink?
The answer to the 【C11】______ feet problem, the researchers found, is that giraffes have 【C12】______ the researchers call a "natural anti-gravity suit". It 【C13】______ out that the skin and other 【C14】______ in their legs and feet are 【C15】______ stiffer and tougher than those of other 【C16】______ . As a result, the blood vessels in the leg cannot swell.
Therefore, the blood has nowhere to go but back to the heart. What about blood rushing to the head 【C17】______ the giraffe bends down to drink? The researchers found that the giraffe's jugular vein, which 【C18】______ blood from the head back to the heart, has lots of one-way valves in it. In the giraffe's neck, there are lots of muscles that flex and relax repeatedly as the animal moves its head and sucks 【C19】______ drinking water. By squeezing the valved jugular vein, they 【C20】______ blood moving back to the heart even while the animal is drinking.
【C1】
A.bring
B.produce
C.transfer
D.pump
根据以下资料,回答{TSE}题。 Archive Gallery:The Best of Bionics(仿生学){TS}“Cats”, “monkeys”and“giraffes”mentioned in paragraph 1 are examples to illustrate__________.
A. they are highly—evolved species as humans.
B. animals have skills that humans Do not possess.
C. humans Can learn animals’skills.
D. they are skillful in Different ways.
M: Oh, yes, but I wish I could have stayed awake long enough to see the whole thing.
Q: What does the man mean?
(13)
A.He was looking forward to seeing the giraffes.
B.He enjoyed watching the animal performance.
C.He got home too late to see the TV special.
D.He fell asleep in the middle of the TV program.
According to the passage, the reason why ______ is still unknown to the scientists.
A.smaller animals such as rodents tend to sleep more while larger animals such as giraffes sleep less
B.large animals, even humans would sleep at all even though they have small energy savings
C.humans save merely 120 kilocalories a night (about the equivalent of an apple) by sleeping
D.part of the function of sleep is to cool off the brain______.
Please compare Letter A with Letter B, and comment on both of them. Then, revise your favorite one for effectiveness. You might rewrite or add any information if necessary. Letter A Dear Mr Hope Thanks for your tel call yesterday. Glad you agree on the price. We will deliver as soon as we can, probably sometime next month. Yours sincerely Letter B Dear Mr Hope Further to our telephone conversation yesterday, we confirm that we are happy to accept your Order, number 231, subject to the alteration on the price of the giraffes. These giraffes will be charged as quoted as $1.0 each. Your Order should be delivered on Wednesday 1 March at approximately 1500hrs. As you have elected to pay cash on delivery, please ensure that you have the money ready to pay. The total cost of the goods will be $ 20,356. We thank you for your valued order. Yours sincerely
I have had my eyes tested and the report says that my ________ is perfect.
A) outlook
B) vision
C) horizon
D) perspective
A.number
B.vast
C.majority
A、headache and sore eye
B、headache and sore throat
C、stomachache and sore throat
D、stomachache and sore eyes
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!