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
80
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.
【C16】
选项
A、by
B、with
C、as
D、on
答案
A
解析
根据空格前后的内容可判断,公象在交配季节(annual mating)的特点是攻击性增强 (increased aggressive),因此空格处需填入能和characterize搭配,又能满足句子逻辑的介词。be characterized by意为“以……为特征”,故选A项by。
转载请注明原文地址:https://kaotiyun.com/show/S3MD777K
0
考研英语二
相关试题推荐
Peoplegenerallyassumethatwhentheyconsideranotherpersona"friend,"thatpersonalsothinksofthemasafriend,whichme
Scientistssentpatternsofelectricitycoursingacrosspeople’sbrains,coaxingtheirbrainstoseelettersthatweren’tthere.
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】________tothem,whetherfromC
随机试题
北美自由贸易区的成员国有()
引起肾的颗粒细胞释放肾素的因素有()(2009年)
免疫复合物所致基底膜损伤是由于中性粒细胞释放下述何种物质引起的
在我国,商业银行是指依照《中华人民共和国商业银行法》和《中华人民共和国公司法》设立的从事()等业务的企业法人。
对国务院各部门和地方各级政府的财政收支,对国家的财政金融机构和企事业组织的财政收支进行审计监督的机关是()。
事业单位要贯彻按劳分配与按生产要素分配,效率优先、兼顾公平的分配原则,扩大()分配自主权,逐步建立重实绩、重贡献,向优秀人才和关键岗位倾斜,形式多样、自主灵活的分配激励机制。
太阳系的小行星带分布在()。
“高原不倒千年骨,告慰炎黄有子孙”与“尽道隋亡为此河,至今千里赖通波”中的“高原”与“河”分别指的是我国的()。
下列对IPv6地址FF60:0:0:0601:BC:0:0:05D7的简化表示中,错误的是
A、Thewomanisconfidenttoimprovestudents’psychologicalproblems.B、Thewomanisapsychologist.C、Themanseemstohavepsy
最新回复
(
0
)