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
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the s
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the s
admin
2021-02-21
115
问题
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the same womb as his sister causes her to develop bigger teeth than she otherwise would. Girls with twin brothers perform better on spatial-ability tests. They have better ball skills than most females and are more likely to be short-sighted. Now it seems that sharing the womb also has a harmful effect on the sexual reproduction of women with a twin brother.
Virpi Lummaa of the University of Sheffield, in Britain, and her colleagues made the claim after studying detailed data from several generations of church records from many parishes in Finland. They report that women with a twin brother were 15% less likely to get married than were women with a twin sister. Those with a male twin also had a 25% lower chance of giving birth even though they lived just as long as those with a female twin. When the researchers considered only married women, those with a twin brother on average had two fewer children during their lifetimes than did women with a twin sister. And finally—to rule out any influence of sharing a house as well as a womb—Dr Lummaa checked the results were the same for women whose twin brothers died before they were three months old. The researchers reported their findings in this week’s Proceedings of the National Academy of Sciences.
As with the teeth, the supposed cause of untypical female biology is early exposure to testosterone. This hormone is made by a male fetus’s developing testes from about seven weeks after
conception
and is thought to diffuse, thus influencing his sister’s growth. But the exact mechanism by which a twin brother lowers his sister’s chances of reproductive success is unclear.
Dr Lummaa’s results also suggest that, if a woman wishes to maximize the chances of passing on her genes, she would do better to avoid producing pairs of twins consisting of one boy and one girl and go for a single-sex combination instead. Mothers included in the study who produced opposite-sex twins had 19% fewer grandchildren than did mothers who gave birth to same-sex twins.
Evolutionary theory thus predicts that there should be fewer pairs of girl-and-boy non-identical twins than single-sex pairs of non-identical twins. Whether that is so requires another set of figures. Finnish church records, helpful as they are, do not distinguish non-identical same-sex twins from identical ones. In the eyes of God, unlike those of natural selection, twin girls are created equal.
Which of the following can be an impression on the sisters by twin brothers?
选项
A、Better musical skills.
B、Shorter views.
C、More spatial-competence.
D、Stronger teeth.
答案
C
解析
事实细节题。根据twin brothers和impression定位到第一段。题干问的是孪生兄弟对其孪生姐妹所造成的影响,包含有因果逻辑关系。该段中指出龙凤胎中的女孩在空间想象力测试中表现更胜一筹,故选C项。
转载请注明原文地址:https://kaotiyun.com/show/qmY4777K
0
考研英语二
相关试题推荐
Theauthorthinksthatpullfactors______.People’sdecisionstomigratemightbeinfluencedbyallthefollowingEXCEPT____
JohnDeweybelievedthateducationshouldbeapreparationforlife,thatapersonlearnsbydoing,andthatteachingmust_____
Studythefollowingchartscarefullyandwriteanessayinwhichyoushould:1)describethechartsbriefly,2)interpretthec
Thebesttitleforthispassagewouldbe______.Defenseattorneysarevitaltothejudicialsystembecausewithoutthem,itwo
YouhavejustcomebackfromtheU.S.asamemberofaSino-Americanculturalexchangeprogram.WritealettertoyourAmerican
IwasaddressingasmallgatheringinasuburbanVirginialivingroom-awomen’sgroupthathadinvitedmentojointhem.Through
Tensofthousandsof18-year-oldswillgraduatethisyearandbehandedmeaninglessdiplomas.Thesediplomaswon’tlookanydiff
Awomanwithatwinbrotherhasfewerchildren.Twinbrotherscanleavequiteanimpression.Themerepresenceofaboyinthes
Manyparentsadmitthatthereisthegenerationgapbetweenthemandtheirchildren.Howcanweeliminatethegap?Inthissecti
随机试题
A.疏肝理气,活血通络B.活血化瘀,通脉止痛C.温补阳气,振奋心阳D.通阳泄浊,豁痰宣痹E.豁痰开窍,健脾化湿
艾滋病的传播途径主要包括
构成传染病流行过程的三个基本条件是
某海港航道工程水环境评价工作等级为二级,需预测工程施工期悬浮物影响。根据《环境影响评价技术导则一地面水环境》,可以采用的海湾数学模式有()。
工程成本核算包括的环节有:①核算与分配各项生产费用;②确定成本核算对象,设置成本核算科目,开设成本明细账;③计算年度合同费用;④计算期末工程成本;⑤编制单位工程竣工成本决算。则正确的核算程序是()。
甲公司为增值税一般纳税人,适用的增值税税率为17%,所得税税率为25%,假定销售商品,原材料和提供劳务均符合收入确认条件,其成本在确认收入时逐笔结转,商品、原材料售价中不含增值税。2013年甲公司发生如下交易或事项:(1)3月2日,向乙公司销售商
感测与识别技术包括对信息的编码、压缩、加密等。()
Doyoubelievethatonlyboysdowellinscience?Doesitseemtoyouthatgirlshavebettervoeabulariesthanboys?Inyouropini
______moreattention,thetreescouldhavegrownbetter.
Notlongago,manypeoplebelievedthatbabiesonlywantedfoodandtobekeptwarmanddry.Somepeople(1)______babieswerenot
最新回复
(
0
)