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
67
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.
【C15】
选项
A、gigantic
B、specific
C、natural
D、similar
答案
B
解析
空格要求填入形容词修饰scent organ(嗅觉器官)。把备选答案代入原文,A项gigantic“巨大的”,文中讨论了大象的嗅觉基因数量很多,并不能推出嗅觉器官很大,故不可选。C项natural“自然的”。“自然的器官”不符合常用表达。D项similar“相似的”,用于表示两个东西的对比。而原文中用了表单数的不定冠词a,故排除。B项specific“独特的,与众不同的”,可以表示大象的嗅觉器官和其他动物的不同,因此确定B项为答案。
转载请注明原文地址:https://kaotiyun.com/show/v3MD777K
0
考研英语二
相关试题推荐
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
随机试题
Generally,WilliamShakespeare’sdramaticcareercanbedividedinto______periods.
A.温邪犯表,肺卫失宣B.邪热壅肺,肺气郁闭C.热灼营阴,心神被扰D.邪入气分,热炽伤津卫分证的主要病机是
患者女,52岁。右侧胸痛、刺激性咳嗽4周,活动后气促2周,无发热,无盗汗,活动后气促。查体:气管居中,右侧肺叩诊浊音,呼吸音消失。胸片、B超提示右侧大量胸腔积液。为明确诊断,该患者下一步检查措施
OT试验阳性表明
A.人流术后3天下腹剧痛B.人流术后流血,经久不止C.人流术后继发不孕D.人流术后闭经,周期性下腹痛E.人流术后月经紊乱人流后感染
钢材在建筑工程中被广泛使用,是因为其具有良好的技术性质,能承受()。
借款人申请展期未获批准时,其贷款从到期次日起转入()。
工资支付主要包括()。
对非领导成员公务员的定期考核采取()方式。
Onceyouarehiredasacompany【11】,youwillprobablyhavebusinesscards.Abusinesscardisprintedwithyourname,title,co
最新回复
(
0
)