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
32
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.
【C17】
选项
A、whenever
B、whatever
C、however
D、wherever
答案
A
解析
空格所在句子意思是:——长劲鹿低头喝水时,血液冲向大脑怎么办?根据句可知whenever符合,所以A正确。
转载请注明原文地址:https://kaotiyun.com/show/eTHC777K
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
_____tothechildrenforChristmasworriedJaneforhours.
Parentshavetodomuchlessfortheirchildrentodaythantheyusedtodoandhomehasbecomemuchlessofaworkshop.Clothes
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrain
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrain
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Summerswithfatherwerealways【B1】______Swimming,hiking,boating,fishing—thedayswerenotlongenoughto【B2】______allofour
Summerswithfatherwerealways【B1】______Swimming,hiking,boating,fishing—thedayswerenotlongenoughto【B2】______allofour
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
Hurricanesareseverecycloneswithwindsoverseventy-fivemilesanhour______originateovertropicaloceanwaters.
A、Brigitteoncechangedherjob.B、BrigittehasneverbeentoDublin.C、BrigitteisgoingtogetmarriedinDublin.D、Brigittei
随机试题
仅用等渗盐水纠正等渗性缺水时。可导致
2013年9月,某施工单位中标一项本地传输网工程,预算建筑安装工程费140万元,其中材料费为40万元,材料由建设单位采购,施工费按建筑安装工程费减材料费后的80%计取,安全生产费按规定计取。签订合同81.2万元,其中施工费为80万元、安全生产费为1.2万元
商业银行提供个人理财顾问服务业务时,不正确的是()。
在业主办理房屋权属证书时,商品住房销售单位应当将代收的专项资金移交给当地()主管部门代管。
【2015河南邓州】父母均为大学教师的小英从小受家庭的影响,很重视学习。初中期间,当她看书学习时,旁边如有人讲话,就特别反感。进入高中后,小英成绩优秀,担任了班长,但同学们都认为她自以为是,什么工作都必须顺着她,一些同学很讨厌她,为此她感到十分苦恼。如果小
某歌词中写到“我听见雨滴落在青青草地,我听见远方下课钟声响起……”,下列相关说法中错误的是()。
2015年1-3月,国有企业营业总收入103155.5亿元,同比下降6%。其中,中央企业收入63191.3亿元,同比下降7%。地方国有企业收入39964.2亿元,同比下降4.2%。1-3月,国有企业营业总成本10034.5.5亿元,同比下降5.1
运用内外均衡理论联系我国实际说明如何做好内外政策协调。(中国人民大学)
2014年3月2日,甲、乙离婚并分割了共同财产。2015年3月8日,甲发现乙在离婚时将属于夫妻共有的40万元存款转移到了乙兄的银行账户中,遂向人民法院起诉,请求分割该40万元存款。本案的诉讼时效期间起算日为()。(2016一专一21)
在数据库应用系统建模过程中,经常采用UML作为建模工具。关于UML的动态建模机制,下列说法错误的是()。
最新回复
(
0
)