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
12
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] 【C14】
选项
A、tissues
B、vessels
C、pores
D、organs
答案
A
解析
词义辨析题,空格前的and说明空格处的词和skin并列,句意为“它们腿和脚上的皮肤和其他______”,tissue意为“组织”,符合句意,所以A正确,vessel意为“血管”,pore意为“小孔”,organ意为“器官”
转载请注明原文地址:https://tihaiku.com/zcyy/3461450.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:(17)Whichsocialproblemdoyouthinkthegovernmentneedstoc
Mr.Hallunderstandsthat______mathhasbeeneasyforhim,itisnoteasyforth
Whatdoesthispassagetellus?Ittellsuswhyourbrains______.[br][origina
根据《工程咨询行业管理办法》,关于评估咨询机构任务承担的说法,正确的有( )。A
A.猫 B.猪 C.犬 D.牛 E.人细粒棘球绦虫的终宿主是
下列说法中,符合有限责任公司注册资本要求的有( )。 A、投资公司可以在五年
下列不属于绞窄性肠梗阻的典型临床表现的是( )。A.早期出现休克 B.腹胀
通过促进外周组织利用葡萄糖、抑制肝葡萄糖输出而降低血糖的药物是 A.磺脲类B
根据《建设工程安全生产管理条例》,工程监理单位的安全生产管理职责是()。A
材料商为某施工单位供应水泥,委托运输公司运输。由于施工急需,交货地由原来合同约定
最新回复
(
0
)