首页
登录
职称英语
An adult giraffe’s head is about six feet above its heart. This means that to 【C
An adult giraffe’s head is about six feet above its heart. This means that to 【C
游客
2023-07-17
56
管理
问题
An adult giraffe’s head is about six feet above its heart. This means that to 【C1】______ enough blood up to the brain the circulatory 【C2】______ must be strong enough to keep the blood at very high pressure.
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. [br] 【C3】
选项
A、unusually
B、generally
C、uncomfortably
D、commonly
答案
A
解析
词义辨析题,空格所在句意为:生物学家已经发现长颈鹿有______很高的血压能解决这个问题,由此可知,这个很高的血压应该是与众不同的,所以A正确
转载请注明原文地址:https://tihaiku.com/zcyy/2845175.html
相关试题推荐
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
Anadultgiraffe’sheadisaboutsixfeetaboveitsheart.Thismeansthatto【C
随机试题
[originaltext]W:Hello,John,whatcanIdoforyou?M:Well,Iheardaboutthe
Aseveryschoolboyknows,insectspollinateflowers,whilebirdsandmammals
MercedesestatecarsandFiatrunarounds(轻便小汽车)arebeingusedtotestupto
为确定疾病防治工作的重点,制定防治措施和对策提供依据的是()A.个体评价 B
猩红热病的特殊体征是()。A.腋下皮疹呈“柯氏斑” B.腋下皮疹呈“帕氏线”
千斤顶应()。(A)设置在平整、坚实处(B)并用垫木垫平(C)千斤
某软弱地基采用换填法处理: ①某一内墙基础传至室内地面处的荷载值为Fk=2
必然王国与自由王国是社会发展的 A.两个不同阶段B.两条不同道路
价值型股票基金与成长型股票基金相比()A:投资风险一样B:投资风险高低无法比较
Apgar评分为3分的小儿首先需要处理的是( )。A.吸尽呼吸道堵塞物 B.
最新回复
(
0
)