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
77
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.
【C12】
选项
A、differ
B、organize
C、gather
D、separate
答案
A
解析
从下文论述的“马有1,000个嗅觉基因,兔子有750个,老鼠有1,200个”可知,不同类种的哺乳动物的嗅觉基因数量不同,故选A项differ“与……有不同”。B项organize“组织”、C项gather“聚集”和D项separate“分开”都无法解释下文的各个物种(马、兔子、老鼠)的基因数量差异。
转载请注明原文地址:https://kaotiyun.com/show/e3MD777K
0
考研英语二
相关试题推荐
Scientistssentpatternsofelectricitycoursingacrosspeople’sbrains,coaxingtheirbrainstoseelettersthatweren’tthere.
Scientistssentpatternsofelectricitycoursingacrosspeople’sbrains,coaxingtheirbrainstoseelettersthatweren’tthere.
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Howseriouslyshouldparentstakekids’opinionswhensearchingforahome?Inchoosinganewhome,CamilleMcClain’skidsh
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
随机试题
某产妇,26岁。临产17小时,阴道有少量淡绿色液体流出,宫缩25秒/6~8分,胎心音150次/分,肛查宫口开大2cm,宫颈轻度水肿,先露一2。根据产妇病情,不应进行哪项处理
政府增加购买性支出,对社会的生产和就业及国民收入分配的影响是()。【2008年真题】
2012年,黄山市全年接待海内外旅游者3641.3万人次,比上年增长19.2%。其中:接待国内旅游者3481.0万人次,增长19.1%;接待入境旅游者160.3万人次,增长22.0%。在入境旅游者中。外国人92.8万人次,增长21.6%;港澳台同胞67.5
()食物中毒可出现“肠源青紫症”。
实施幼儿德育最基本的途径是()。
材料1从2018年5月1日起,J市Z区进入为期6个月的汛期。为扎实做好防汛工作,保证抗洪抢险和救灾工作高效有序进行,最大限度地减少人员伤亡和财产损失,Z区成立了区防汛指挥部。区长任总指挥长,区各相关职能部门及各街道负责人为指挥部成员。办公室设在区
与2016年相比,2017年4个银行中,“利润总额”的增长率最大的银行是()。
道路交通事故是指车辆在道路上因过错或者意外造成的人身伤亡或者财产损失的事件。其中“道路”,是指公路、城市道路和虽在单位管辖范围但允许社会机动车通行的地方,包括广场、公共停车场等用于公众通行的场所。“车辆”,是指机动车和非机动车。“非机动车”,是指以人力或者
说明数组后,数组元素的初值是
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughtsarecausingf
最新回复
(
0
)