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
外语
An adult giraffe’s head is about six feet above its heart. This means that to 【C1】______ enough blood up to the brain the circul
An adult giraffe’s head is about six feet above its heart. This means that to 【C1】______ enough blood up to the brain the circul
admin
2012-12-13
92
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.
【C10】
选项
A、following
B、returning
C、flowing
D、pouring
答案
C
解析
词义辨析题,根据句意可知,长颈鹿头低下的时候,血液流回到心脏比较困难,所以C正确,return作不及物动词时虽然也可以表示“返回”,但它本身已经包含back的含义,所以排除
转载请注明原文地址:https://kaotiyun.com/show/8Cw7777K
0
大学英语四级
相关试题推荐
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderly
A、Hewasextremelyangry.B、Hewouldn’tforgiveBen.C、Hewasquitedisappointed.D、Hecouldn’tunderstandBen.A由女士提到的Nowonder
FatStigmaSpreadsAroundtheGlobeInMexico,thelatestanti-obesity(肥胖)publichealthcampaignshowspeoplewithbulging
FatStigmaSpreadsAroundtheGlobeInMexico,thelatestanti-obesity(肥胖)publichealthcampaignshowspeoplewithbulging
A、Hewon’tcomeatall.B、Hewillbelateasusual.C、Heisapunctualperson.D、Hewillcomeontimetonight.D对话中女士说...waitfo
A、Theyoftenstayuplatereading.B、Theyworkhardandplayhard.C、Theyliketogocampinginsummer.D、Theytrytoearnmore
A、Englishteaching.B、Stafftraining.C、Careersguidance.D、Psychologicalcounseling.C对话中男士提到他在诺丁汉大学取得了学位后didcareersworkins
What’syour______towardstheadvancedtechnologyinforeigncountries?
Manyofthepeoplewhoappearmostoftenandmostgloriouslyinhistorybooksaregreatconquerorsandgeneralsandsoldiers,wh
随机试题
患者,男,85岁。动作迟缓,健忘恍惚,腰膝酸软,头晕耳鸣,齿摇发脱;舌淡红,苔白,脉沉无力。根据辨证要点分析,该患者的症候是
简述郭璞《游仙诗》的内容。
下列哪些行政行为不收费
屈肘时在肘窝中央可触及的肌腱是()。
水平逻辑验证指标和验证方法的内容关系中,在产出目标层次中,信息方法的验证方法有()。
旅游团队的主要社交活动形式有()
1.题目:走进键盘大家庭2.内容:背景故事:星期天,我去拜师学艺;快说说,老师都教了你什么?让我们也学习学习。老师给了我一本秘籍,让我照着上面的方法练习。我想输入“+”,可是用怎么也打不出来,快看看秘籍上是怎么说的。行动要领:了解键盘分区;用键盘输入
以上所列的液晶电视尺寸的市场占有率中,尺寸为20寸的排名第几?()市场占有率前三的尺寸的液晶电视占整个市场的()。
Completethenotesbelow.WriteNOMORETHANTHREEWORDSAND/ORANUMBERforeachanswer.GOODBYEPARTYFORJOH
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
最新回复
(
0
)