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] 【C9】
选项
A、crush
B、brush
C、push
D、rush
答案
D
解析
词义辨析题,本句意思是长颈鹿低头喝水时,血液应该______到大脑,rush意为“冲;急流”,符合句意,所以D正确,crash意为“压碎”,brash意为“刷”,push意为“推动”
转载请注明原文地址:https://tihaiku.com/zcyy/2845181.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
ThelargestcityinAustraliaisA、Canberra.B、Sydney.C、Melbourne.D、Perth.B悉尼是
NarratorListentoaconversationbetweentwostudents.Nowgetreadytoanswer
下列关于隧道洞口施工的说法中,正确的有()。A.应遵循"晚进洞、早出洞"的
如果止血带压迫静脉超过2分钟,会发生A.血氧含量降低 B.乳酸增加 C.清蛋
股票的市场价格由股票的价值决定,同时还受许多其他因素的影响,其中最直接的影响因素
正常粪便中球菌与杆菌的比例为A.1∶10B.1∶2C.1∶1D.2∶1E.5∶1
简述现代企业人力资源管理各个历史发展阶段的特点。
下列关于“运用资本资产定价模型估计权益成本”的表述中,错误的是()。A.通
(2016年真题)增值税一般纳税人销售自产的下列货物中,可以选择按照简易办法计算
男性,70岁,腹部疼痛6天,以右下腹为重,伴呕吐。检查:急性病容,右下腹饱满压痛
最新回复
(
0
)