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
29
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] 【C4】
选项
A、half
B、multiple
C、double
D、pair
答案
C
解析
词义辨析题,根据空格前面句子意思可知,空格处应该是一个表示倍数的词,double名词表示“两倍”,符合句意,所以选C,前面提到长颈鹿的血压很高,所以排除A;multiple只是指“倍数,若干”,但是没有说明是多少倍,所以排除
转载请注明原文地址:https://tihaiku.com/zcyy/2845176.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]Disastermoviesoftenportraycatastrophesthatdestroy,ora
A.clinicalB.communicationC.compromisesD.criticallyE.elimina
[originaltext]M:Hello,Ihaveareservationfortonight.W:Yourname,please.
A.1,2 B.2,1 C.-2,-1 D.-2,1
任何一个团队从开始组建到最终达到绩效要求,需要一个周期。依据塔克曼群体发展模型,
对细粒土,要求在最优含水量下压实,主要是考虑( )。A.在最优含水量下压实,能
导致女方不孕最常见的因素是()A.子宫因素 B.子宫颈因素 C.输卵管因素
痛经湿热瘀阻证,其主要证候中,以下哪项是错误的A.低热起伏,小便黄赤 B.经血
皮亚杰怎样解释道德判断的发展阶段?
下列关于贷款组合信用风险的说法中,错误的有()。A.贷款组合内的各单笔贷款之间
最新回复
(
0
)