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
Being a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near Ldance
Being a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near Ldance
admin
2015-06-11
17
问题
Being a man has always been dangerous.There are about 105 males born for every 100 females, but this ratio drops to near Ldance at the age of maturity, and among 70- year-olds there are twice as many women as men.But the great universal of male mortality is being changed.Now, boy babies survive almost as well as girls do.This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate.More important, another chance for natural selection has been removed.Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight.
选项
答案
身为男人,总是有危险。男女出生比率大约为105:100,但到成年时,这种比率下降,几乎达到平衡,在70岁的老年人中,女性比男性多一倍。可是男性死亡率普遍高的现象正在改变。如今的男婴和女婴的存活率一样高。这意味着,男孩到了寻找伴侣的关键年龄,将首次出现男孩过剩现象。更重要的是,自然选择的另一个可能性被排除了。50年前,婴儿(尤其是男婴)存活下来的几率取决于其体重。
解析
转载请注明原文地址:https://kaotiyun.com/show/RbQi777K
0
在职申硕(同等学力)英语
相关试题推荐
Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.【C1】______theturnofthecenturywhenjazz(爵士乐)wasborn,Am
ThefarmministersscheduledanemergencymeetinginLuxembourginhopesofeasingtheworldwide"madcow"panic.
Progressincommunicationandtransporttechnologiesduringthe20thcenturyhasenabledustoovercomegeographicalboundaries
ComputerscanbeatchesschampionGaryKasparovathisgame,countalltheatomsinanuclearexplosion,andcalculatecomplexf
A:Youseemtohavealotofworktodoinyouroffice.You’vealwaysbeenworkingovertime.B:______
Thebatisamarvelofevolutionaryadaptation.Mostofthemroostduringtheday,andareactiveatnightortwilightforthey
Participantobservationalsoreflectsanthropology’sdualnatureasbothascientificandahumanisticdiscipline.Throughthes
Althoughinteriordesignhasexistedsincethebeginningofarchitecture,itsdevelopmentintoaspecializedfieldisreallyqui
Shealwayshandlestheproblems______herownexperienceandprinciples.
Alltheroomsonthesecondfloorhavenicely______carpets,whichareincludedinthepriceofthehouse.
随机试题
药物利用评估的对象包括
依据《煤矿安全监察条例》的规定,煤矿作业场所的瓦斯、粉尘或者其他有毒有害气体的浓度超过国家安全标准或者行业安全标准,经煤矿安全监察人员责令立即停止作业,拒不停止作业的,由煤矿安全监察机构责令停产整顿,可以处()的罚款。
影响城市轨道交通线网方案的主要因素中,与建设相关的主要因素是()
根据《建筑法》,下列不属于领取施工许可证的条件是()。
协会以外主体做出的、符合相关规定条件的奖励信息,会员应自收到对本单位及本单位从业人员奖励决定文书之日起()个工作日内向协会诚信管理系统申报,协会审核后记入诚信信息系统。
下列()不属于税率的基本形式。
健康心理学至今尚不是一门成熟的学科,原因是()。
美妙的音乐很悦耳,像春风拂过面颊,这属于()。
对下述理论进行分析,论述你同意或不同意这一观点的理由。可根据经验、观察或者阅读,用具体理由或者实例佐证自己的观点。题目自拟,字数在700字左右。一说起模仿,有人就会援引“东施效颦”、“邯郸学步”的例子,把模仿贬得一无是处。但这些人恰好忘记了“胡服骑
Oneoftheworstthingyoucandoasaspeakeristoholdyour【M1】______armsstifflyatyourside.Youneedtomoveyourarms
最新回复
(
0
)