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
2015-11-27
59
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.
【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。be 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。
转载请注明原文地址:https://kaotiyun.com/show/dBsZ777K
0
考研英语一
相关试题推荐
【F1】Americansnolongerexpectpublicfigures,whetherinspeechorinwriting,tocommandtheEnglishlanguagewithskillandg
【F1】Itisnolongerjustdirtyblue-collarjobsinmanufacturing;thatarebeingsuckedoffshorebutalsowhite-collarservicej
Halfoftheworld’spopulationwillbespeakingorlearningEnglishby2015,researcherssay.Twobillionpeopleareexpectedto
Recyclingalsostimulatesthelocaleconomybycreatingjobsandtrimsthepollutioncontrolandenergycostsofindustriesthat
Anditisimaginedbymanythattheoperationsofthecommonmindcanbynomeansbecomparedwiththeseprocesses,andthatthe
【F1】Mostpeopleknowthatawkwardfeelingwhenyoushuffleintoanelevatorwithotherpeopleandtrynottomakeeyecontact.【
【F1】Whenadiseaseofepidemicproportionsripsintothepopulace,scientistsimmediatelygettowork,tryingtolocatethesour
TwomonthsagoyougotajobasaneditorforthemagazineDesigns&Fashions.Butnowyoufindthattheworkisnotwhatyouex
Globalwarmingmayormaynotbethegreatenvironmentalcrisisofthe21stcentury,but—regardlessofwhetheritisorisn’t
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
随机试题
经营者对消费者权益保护法的遵从属于【】
过去、现在与未来的连接点是
大剂量丙种球蛋白静脉注射治疗川崎病,以预防冠状动脉损害的用药时间及剂量是
下列关于儿童用药的特点,哪项说法是正确的()。
法律格言说:“不知自己之权利,即不知法律。”关于这句法律格言涵义的阐释,下列哪一选项是正确的?
甲房地产开发企业(以下简称甲企业)新建一普通商品住宅小区。小区在建期问就开始预售,完工后又以现房形式出售。在规定期间,甲企业经其商业伙伴推荐,未通过招投标,也未经有关部门批准,采用协议方式直接聘用乙物业服务企业负责该小区的物业管理。该行为违反了相关规定,甲
国际公认的外债警戒线比重值是(),如果低于它,则表明外债结构合理,反之则预示着存在外债风险。
党的十八大报告指出,党领导人民制定宪法和法律,党必须在宪法和法律范围内活动。任何组织或者个人都不得有超越宪法和法律的特权,绝不允许()。
下面属于软件设计阶段产生的文档是()。
设栈的顺序存储空间为S(1:m),初始状态为top=m+1。现经过一系列正常的入栈与退栈操作后,top=0,则栈中的元素个数为
最新回复
(
0
)