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
52
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.
【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/FlEZ777K
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
关于宇宙起源的科学发现——1998年英译汉及详解Theywere,byfar,thelargestandmostdistantobjectsthatscientistshadeverdetected:astripof
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
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
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
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
感光最敏锐的部位是()
糖尿病病人多发性周围神经病变,其表现下列哪项不妥()
以下药物中哪一个临床应用其右旋体
(2015年)案情:甲欲出卖自家的房屋,但其房屋现已出租给张某,租赁期还剩余1年。甲将此事告知张某,张某明确表示,以目前的房价自己无力购买。甲的同事乙听说后,提出购买。甲表示愿意但需再考虑细节。乙担心甲将房屋卖与他人,提出草签书面合同,
简述小学教师撰写操行评语的注意事项。
教师要帮助学生不断尝试各种学习策略,指导学生___________使用策略的情况和效果,并要根据需要及时调整,以提高他们的___________。
一线民警在工作中遇到职业暴露风险时,应及时采取有效措施,降低疾病感染风险。派出所民警小李在检查一名疑似携带艾滋病病毒的吸毒人员时,右手皮肤不慎被其兜中的注射器针头扎破,但未出血。针对此状况,现场紧急局部处理的第一个步骤是()。
ШЧШЧцБЦБ
我有很多书想读,却读不进去,以致很多想了解的学问,都难以了解。牟宗二三先生回忆年轻时在北大读书,有一天得到熊十力的《新唯识论》,一个晚上就读完了。这怎么可能呢?这部书一直放在书架上,我曾多次打开它,但都读不进去。有一次,我在美国作家迪拉德的《听溪者的朝圣》
ThestaffofNormandyCrossingElementarySchooloutsideHoustoneagerlyawaitedtheresultsofstateachievementteststhisspr
最新回复
(
0
)