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
51
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://www.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
Shelookedoutofthewindowtoseeifit______.A、wasrainingB、hasrainedC、is
Educationalphilosophyhaschangedagreatdealinthe50yearssinceIwas
Room504,XiamenHotelXiamenDecember26th,2008DearSirorMadam,Iarriv
正确的电缆直埋敷设做法有()。A.铠装电缆的金属保护层可靠接地 B.电缆中间
患者,女,35岁。有胃溃疡,吐血黯淡,大便漆黑,面色苍白,头晕心悸,神疲乏力,纳
深圳吉昌设备有限公司委托深圳机械进出口公司(3122366452)进口一批凸轮轴
某机电施工单位承接一项炼油厂的塔体群安装工程,工程内容包括:各类塔体就位、各类管
(2017年真题)下列装饰装修工程中,通常需要洒水养护的有()。A.整体面层
(2016年真题)工程项目盈亏平衡分析的特点是()。A.能够预测项目风险发
关于儿童风湿热的相关发病机制是A:链球菌直接损伤 B:Ⅲ型变态反应 C:Ⅳ型
最新回复
(
0
)