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
87
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.
【C1】
选项
A、given out
B、dedicated to
C、limited to
D、hit upon
答案
B
解析
空格要求填入过去分词作后置定语修饰宾语the largest number of genes(最大数量的基因)。后置定语中的名词为smell(嗅觉),从“基因决定机能”的常识可知,空格前的genes决定着空格后的smell。B项dedicated to意为“专注于;把……用在”,此处意为“嗅觉基因”。
转载请注明原文地址:https://kaotiyun.com/show/B6sZ777K
0
考研英语一
相关试题推荐
Halfoftheworld’spopulationwillbespeakingorlearningEnglishby2015,researcherssay.Twobillionpeopleareexpectedto
【F1】Mostpeopleknowthatawkwardfeelingwhenyoushuffleintoanelevatorwithotherpeopleandtrynottomakeeyecontact.【
【F1】Muchofthelanguageusedtodescribemonetarypolicy,suchassteeringtheeconomytoasoftlandingoratouchonthebrak
【F1】Breathingparticulate-laden(akasmoggy)airmaybehardeningyourarteriesfasterthannormal,accordingtoresearchpublishe
Immigrationstirsupstrongenoughfearstojustifyquestionablemeasuresofprotectionagainstit—fromarrestsatthedoorsof
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Collegegraduatesarenowleavingschoolwithnotonlyadiploma,butalsowithmoredebtthaninanyotherperiodinhistory.A
Collegegraduatesarenowleavingschoolwithnotonlyadiploma,butalsowithmoredebtthaninanyotherperiodinhistory.A
随机试题
思维定势
函数f(x,y)=2x2+ax+xy2+2y在点(1,-1)处取得极值,则a=________.
水源暴发流行的肝炎最常见的病原是
患者男,20岁,头部被木棒击伤后昏迷12分钟,清醒后诉头痛并呕吐1次,入院后患者若出现急性颅内压增高,伴随其出现的生命体征是
总分类账户可以用总分类账户本期()对照表替代。
下列选项中,可用作单一投资方案可行与否判定的是()。
某股份有限公司从20X1年1月1日起对期末存货采用成本与可变现净值孰抵计价,成本与可变现净值的比较采用单项比较法。该公司20X1年6月30日A、B、C三种存货的成本分别为:30万元、21万元、36万元;A、B、C三种存货的可变现净值分别为:28万元、25万
下列成语中画线的字的字形、读音全对的一组是:
打开Word2003文档一般是指()。
A、Absent-mindednessandinattention.B、Seriousemotionalproblems.C、Heartattacks,strokesandkidneydisease.D、Pooreyesight.
最新回复
(
0
)