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
17
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.
【C10】
选项
A、following
B、returning
C、plowing
D、pouring
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/dTHC777K
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
Everysporthasitsgreatlegends:soccerhasPele,andbasketballhasMichaelJordan.Isthereone【B1】______whompeopleconside
Everysporthasitsgreatlegends:soccerhasPele,andbasketballhasMichaelJordan.Isthereone【B1】______whompeopleconside
By【B1】______afewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren’slanguagedevelopm
—Youknowwhocameyesterday?—YaoMing?Wehadabasketballmatch.—______Hecameandwatchedthegame.
—Wouldyoulikesomemoresoup?—______.Itisdelicious,butI’vehadenough.
A、enoughB、aboutC、countD、backgroundA
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Summerswithfatherwerealways【B1】______Swimming,hiking,boating,fishing—thedayswerenotlongenoughto【B2】______allofour
Summerswithfatherwerealways【B1】______Swimming,hiking,boating,fishing—thedayswerenotlongenoughto【B2】______allofour
TheUnitedStatesiswell-knownforitsnetworkofmajorhigh-waysdesignedtohelpadrivergetfromoneplacetoanotherinth
随机试题
在用煤焦油瓷漆补口、补伤时,要求压边宽度为20~30mm。
按照规定,企业的盈余公积可以用于( )。
2×16年12月31日,甲公司持有专门用于生产丙产成品的乙原材料200吨,单位成本为20万元/吨,每吨乙原材料可加工生产丙产成品一件,该丙产成品售价为21.2万元/件,将乙原材料加工至丙产成品过程中发生加工费等相关费用共计2.6万元/件。当日,乙原材料的市
财务预测是财务管理的核心,预测的成功与否直接关系到企业的兴衰成败。()
合伙企业中,合伙协议约定的经营期限届满的,合伙企业应当解散。()
某事业单位2013年末结账前,“经营收入”科目贷方余额为432万元,“经营支出”科目借方余额为360万元,“销售税金"科目借方余额为63万元;当年“销售税金”科目的余额中为经营活动所发生的金额为52万元。则该单位2013年的经营结余为()万元。
上市公司甲集团公司(以下简称甲公司)是ABC会计师事务所的常年审计客户,主要从事化妆品的生产和销售。A注册会计师担任甲集团公司2017年度财务报表审计项目组负责人,确定集团财务报表整体的重要性为200万元。资料一:甲公司于2017年12月31日拥有B公
材料:某教师在“探究鼠妇是否喜欢生活在光亮的环境中”的实验教学中,设计的实验过程和得到的结果如下所示。实验准备:全班30名学生分成3组,做好组员分工和数据记录,每组5只鼠妇,1个黑纸盒、1块黑纸板、1块玻璃板。实验步骤:
Lilyiskindandalways______herhelptoothers.
下列关于粉尘爆炸的说法错误的是:
最新回复
(
0
)