首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
An adult giraffe’s head is about six feet above its heart. This means that to【C1】______enough blood up to the brain the circulat
An adult giraffe’s head is about six feet above its heart. This means that to【C1】______enough blood up to the brain the circulat
admin
2016-03-05
43
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(晕倒)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(颈静脉的)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(曲折;收缩)and relax repeatedly as the animal moves its head and【C19】______up drinking water. By squeezing the valved jugular vein, they【C20】______blood moving back to the heart even while the animal is drinking.
【C6】
选项
A、terrible
B、unreliable
C、unsolvable
D、advisable
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/zHHC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
By【B1】______afewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren’slanguagedevelopm
By【B1】______afewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren’slanguagedevelopm
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrain
Mostyoungpeopleenjoyphysicalactivities,walking,cycling,football,ormountaineering.Thesewhohaveapassion【C1】____
Summerswithfatherwerealways【B1】______Swimming,hiking,boating,fishing—thedayswerenotlongenoughto【B2】______allofour
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
Henevermarried,buthislifewas______lonely.
随机试题
“大数据”是当前众多领域关注和应用的热门话题,下列关于“大数据”特点的叙述,正确的有_______。
她在英语演讲中得了一等奖,感到非常兴奋。
蛔虫病的辨证纲领是
在建设项目合理利用资源,节约能源,提高土地利用率中,应充分利用()。
设备监理人员安装设备的重要性分类,采用书面查询、现场调查等方式对供应商或分供商就( )进行调查。
资产信息资料,按信息来源可分为()。
甲公司购进一台价值120万元的机器设备,向保险公司投保。保险合同约定保险金额为60万元,但未约定保险金的计算方法,后保险期间发生了保险事故,造成该设备实际损失80万元;甲公司为防止损失的扩大,花费了6万元施救费。根据保险法律制度的规定,保险公司应当支付给甲
加工橘子罐头,采用酸碱处理脱去中果皮(橘络)会产生严重污染。目前使用酶解法去除橘络可减少污染,下列生长在特定环境下的4类微生物可以大量产生所用酶的有()。
甲企业与乙银行签订借款合同,借款金额为10万元人民币,借款期限为1年,由丙企业作为借款保证人。合同签订3个月后,甲企业因扩大生产规模急需资金,遂与乙银行协商,将贷款金额增加到15万元,甲和银行通知了丙企业,丙企业未予答复。后甲企业到期不能偿还债务。该案中的
在课程评价模式中,认为教育活动中所需的评价应该是广义的,应有助于方案的改进,不限于确定目标是否达成,评价的最大目的在于为学校行政人员、校方领导以及学校的教师们提供信息,以便在必要时对方案加以修订的是()
最新回复
(
0
)