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
2024-02-18
10
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] 【C10】
选项
A、following
B、returning
C、flowing
D、pouring
答案
C
解析
词义辨析题,根据句意可知,长颈鹿头低下的时候,血液流回到心脏比较困难,所以C正确,return作不及物动词时虽然也可以表示“返回”,但它本身已经包含back的含义,所以排除
转载请注明原文地址:https://tihaiku.com/zcyy/3461446.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]M:Haveyouthoughtofeatingouttoday?W:I’dlikethat.Ihave
WhatrecommendationsdoesDrJohnsonmakeaboutthejournalarticles?Chooseyou
Earlychildhoodisatimeoftremendousgrowthacrossallareasofdevelopm
Ifyoureallyunderstoodthedifficultie
既能清热化痰,又能除烦止呕的药物是()A.竹茹 B.陈皮 C.贝母
强心苷中毒最严重的反应是()A.胃肠道反应 B.视觉障碍 C.中枢
下列情形中,属于房屋租赁合同自然终止的有( )。A、租赁房屋被司法机关或行政
《变电运维管理规定》:驻地宜设在重要枢纽变电站,原则上地市公司运维班工作半径不宜
清单计价中,关于措施项目费的计算,下列选项中应采用综合单价法计价的有()。
在实际工作中,常用的账务处理程序有()。A、日记总账账务处理程序 B、记账凭证
最新回复
(
0
)