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
52
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]Whatdoyouliketodoinyoursparetime?[/originaltext][origin
Althoughinteriordesignhasexistedsincethebeginningofarchitecture,it
Wherecanyoufindthemeetingroomsinthebuilding?On______.[originaltext]
二级企业有职称的工程技术和经济管理人员不少于( )。 A、300人 B、
近段时间,一个“才子”、一个“佳人”陆续成为朋友圈里的刷屏人物。前者是赵雷,一位
市域城镇体系规划内容不包括( )。A.划定城市规划区 B.制定中心城市与相邻
下列触犯了非法吸收公众存款罪的行为有()。A.个人私设银行 B.企事业单位私
某男性患者,24岁,主诉:近一年来刷牙及咬苹果时牙龈出血,检查:全口PD2~3m
1998年9月1日对某施工现场检查时发现,存储建筑材料的仓库内有15名建筑工人居
某账户的期初余额为500元,期末余额为5000元,本期减少发生额为800元,则本
最新回复
(
0
)