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
考研
If you have ever wondered how an elephant smells, scientists have the answer. Researchers have discovered that African Elephants
If you have ever wondered how an elephant smells, scientists have the answer. Researchers have discovered that African Elephants
admin
2023-02-24
73
问题
If you have ever wondered how an elephant smells, scientists have the answer. Researchers have discovered that African Elephants have the largest number of genes【C1】________smell of any mammal. Given the size of their trunks, and how important it is【C2】________their survival, it is probably unsurprising that an elephant’s nose is not only the longest in the animal kingdom, but also the most effective.
In【C3】________, humans and other primates have a poor sense of smell. "The functions of these genes are not well known,【C4】________they are likely important for the living environment of African elephants," said author Dr Yoshihito Niimura of the University of Tokyo. "【C5】________, an elephant’s nose is not only long but also superior. " The sense of smell is【C6】________to all mammals, and they use it for【C7】________food, finding mates and locating their offspring.
In a study published in Genome Research, scientists【C8】________the 13 mammal species and found that African Elephants have twice the number of smell genes【C9】________dogs and five times more than humans. They have around 2,000 genes alone that are associated with scent. Humans in comparison have just under 400 and some other primates even【C10】________. The study found that 20,000 genes are【C11】________for the sense of smeD in mammals, of which around half are functional, but the collections【C12】________for each species. Horses have around 1,000 smell genes, rabbits around 750 and rats about 1,200.
"The large repertoire of elephant (smell) genes might be attributed to elephants’ heavy【C13】________on scent in various contexts, including social【C14】________and reproduction," added Dr Niimura. African and Asian elephants possess a【C15】________scent organ behind each eye, and male elephants can produce a special substance during annual mating, which is characterized【C16】________increased aggressiveness. And【C17】________studies have revealed that, African elephants can reportedly【C18】________between two Kenyan ethnic groups—the Maasai, whose young men【C19】________manhood by spearing elephants, and the Kamba, who are agricultural people that【C20】________little threat to elephants through smell.
【C11】
选项
A、helpful
B、responsible
C、suitable
D、ready
答案
B
解析
上文提到大象有2,000个基因有助于嗅觉(are associated with scent),此句继续扩展讨论哺乳动物有关基因和嗅觉的话题。responsible for意为“对……负责”,此处指有2万基因对嗅觉负责,即与嗅觉相关,故选B项responsible。如果选A项helpful“有助的”,表明这些基因对嗅觉只是起到辅助功能,表达不确切。C项suitable“合适的”,表示有选择性,而基因并不可选择。D项ready“随时准备的”,be ready for sth. 意为“准备好随时做某事”,基因显然不具备此特征,故不合逻辑。
转载请注明原文地址:https://kaotiyun.com/show/Y3MD777K
0
考研英语二
相关试题推荐
Peoplegenerallyassumethatwhentheyconsideranotherpersona"friend,"thatpersonalsothinksofthemasafriend,whichme
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Howseriouslyshouldparentstakekids’opinionswhensearchingforahome?Inchoosinganewhome,CamilleMcClain’skidsh
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
随机试题
下列属于原始凭证的是()
下列各句中,没有语病的一句是()
进行枢纽布置和坝址、坝型选择时应考虑的影响因素主要有()。
票据丧失的补救措施不包括()。
财政管理体制的基础性内容是()。
在保险合同纠纷中,如果对合同条款有两种以上解释的,人民法院或者仲裁机构应当作出()的解释。
自下而上地开发数据处理系统,将造成企业各部门信息在形式上、定义上和时间上的差异,从而导致了信息系统向企业提供信息的()。
以下关于文件的描述中,错误的是()。
Hereisaposteronamiddleschoolwebsite.Going,Going,Gone!TheHaynesMiddleSchoolParentTeacherOrganization
Accordingtothespeaker,whowouldmostbenefitfrommuItitasking?
最新回复
(
0
)