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
外语
Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by t
Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by t
admin
2014-10-11
43
问题
Elephants don’t forget—at least, female elephants don’t. Elephant families are matriarchal. And the social knowledge gained by the oldest females is the key to a family group’s survival, according to a study published in April by Karen McComb, a biologist at Sussex University in England.
Elephants announce their presence by making a deep, long sound, a practice referred to as contact calling(联络呼叫). An unfamiliar call may mean that an elephant from outside the family group is nearby. A stranger can cause trouble, interrupting feeding or disturbing the young. So an elephant
matriarch
signals the family to gather around her; then they all lift their trunks in the air to smell the unfamiliar caller. False alarms can disturb the group and take time and energy away from feeding, so survival may depend in part on getting it right.
Working with Cynthia Moss, who founded the Amboseli Elephant Research Project in Kenya 30 years ago, McComb tested the social knowledge of 21 Amboseli elephant families with matriarchs 27 to 67 years old. She played recordings of contact calls to each family and found that the oldest matriarchs were much better at picking out unfamiliar calls. In fact, a group with a matriarch in her fifties was several thousand times more likely to form into a group upon hearing an unfamiliar contact call than when hearing a familiar call. However, families with younger matriarchs were less than twice as likely to gather together upon hearing an unfamiliar contact call as compared with a familiar call. And they gathered together a lot. Moreover, the social knowledge of older matriarchs translated into favourable results: Families with older matriarchs produced more baby elephants in each female-reproductive year.
This finding shows how difficult it is to protect the oldest members of elephant families. As elephants age, they continue to grow larger, as do their much wanted tusks(象牙). So the older and wiser a matriarch is, the greater the chance she will be killed. About 800,000 elephants have been killed by people in the past 20 years.
The older a female elephant is,______.
选项
A、the stronger she will be
B、the poorer memory she will have
C、the more useless her tusks will be
D、the more likely she will be killed
答案
D
解析
由第四段“So the older and wiser a matriarch is,the greater the chance shewill be killed."可知D为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/PZxO777K
0
成人本科学位英语
相关试题推荐
Itshamesmetosayit,butItoldaliewhen______atthemeetingbymyboss.
Liberal(自由)educationisbecomingthetaskofteachers.Itis【C1】______notonlytoteachandlearnknowledge,butalsotodevel
I(gotto)theairport,only(tofind)thattheplane(hadleft)(fortenminutes).
(Anumberof)endangered(species)(increases)everyyearandnatural(resourcesdisappear.)
Inorderto(attain)ourobjective,itis(essential)thatwe(willmake)thebestuseofthelimitedresources(available).
We(strongly)suggest(that)Smith(istold)about(his)physicalconditionassoonaspossible.
Extensivenewstudiessuggestthattheworldhasmadeextraordinaryprogressinreducingpovertyinrecentdecades.Theresearch
A(Onlythen)B(hebecame)awareofC(thefact)thatthereweremoredifficultiesaheadD(than)hehadexpected.
Itwouldbeamistaketo______thislawtosituationswhichareoutsidethisrange.
Whenwewalked(past)thetheater,therewerealotofpeople(waited)(in)alonglineoutsidethe(boxoffice).
随机试题
雌激素不能用于治疗绝经期妇女哪种疾病?
单卵双胎若分裂发生在桑椹期(早期囊胚)
肝性脑病最早出现的临床表现是
公共建筑的工作房间一般照明照度均匀度,按国家标准规定应不小于()。
基准收益率的测定方法包括()。
下列宪法中,赋予议会制约政府的权力最小的是()。
从宪法类型上看,英国宪法属于()。
WriteNOMORETHANTWOWORDSORANUMBERDoctorsstartseeingpatientsattheHealthCentrefrom______o’clock.
Allthecommoditiessoldinthatshoparegivenoneyear’s______.
Since2007,theAmericanPsychologicalAssociation(APA)hasconductedasurveyofdifferentaspectsofstressinAmerica,Thisye
最新回复
(
0
)