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
2017-02-17
17
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 smell 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.
【C9】
选项
A、as
B、like
C、with
D、than
答案
A
解析
固定用法。在表示“A有某物是B的几倍”时,表达为A have+倍数+the number of sth.as B,故选A项as,表明非洲大象的嗅觉基因数是犬类的2倍……。
转载请注明原文地址:https://jikaoti.com/ti/n3v7FFFM
0
考研英语一
相关试题推荐
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybeagameofsome【B1】______—football,hockey,golf,ortennis.It
技术与天才哪个对科学发展更重要——1994年英译汉及详解Accordingtothenewschoolofscientists,technologyisanoverlookedforceinexpandingthehori
技术与天才哪个对科学发展更重要——1994年英译汉及详解Accordingtothenewschoolofscientists,technologyisanoverlookedforceinexpandingthehori
人类性格与行为形成的原因及影响——1990年英译汉及详解Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.Itisnote
随机试题
血源性肺脓肿好发部位最多见于
药学职业道德的根本宗旨是()
县级以上地方各级人民政府应当组织有关部门制定本行政区域内()生产安全事故应急救援预案,建立应急救援体系。
用成本法估价时,建筑物的现值=()。
质量教育培训内容包括()。
根据所给资料,回答下列问题。2015年,我国快递业务量完成206.7亿件,实现业务收入2770亿元。全年同城快递业务量完成54亿件,同比增长52.3%;实现业务收入400.8亿元,同比增长50.7%。全国异地快递业务量完成148.4亿
关于保险合同中的保险人责任免除条款,以下说法中哪些是正确的?()
若f(x)在(x,b)内单调有界,则f(x)在(x,b)内间断点的类型只能是()
Thenexttimethemenweretakenupontothedeck,Kuntamadeapointoflookingatthemanbehindhiminline,theonewholay
Tomwasverylucky______withhislife:healmostdidnotgetoutoftheroom.
最新回复
(
0
)