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
More boys than girls are born all over the world, but a new study has found that the closer people live to the equator(赤道), the
More boys than girls are born all over the world, but a new study has found that the closer people live to the equator(赤道), the
admin
2017-06-11
81
问题
More boys than girls are born all over the world, but a new study has found that the closer people live to the equator(赤道), the smaller the difference becomes. No one knows why.
The imbalanced sex ratio at birth has been known for more than a hundred years, and researchers have found a large variety of social, economic and biological factors that relate to the sex ratio at birth-war, economic stress, age, diet, selective abortion and more. But latitude(纬度)is a natural phenomenon, unaffected by cultural or economic factors.
To look at the effect of latitude, Kristen J. Navara of the University of Georgia used the latitude of the capital city in 202 countries, as well as 10 years of data on sex ratio at birth and annual variations in day length and temperature. Dr. Navara performed a statistical analysis which showed that there was a significant relation between sex ratios in favor of boys and latitude. African countries produced the lowest sex ratios—50. 7 percent boys—and European and Asian countries had the highest with 51. 4 percent.
There are some possible explanations, but none entirely satisfactory. It could be that there is some survival value in producing more girls in warmer regions, but it is unclear what this might be. There may be genetic or racial differences that could explain it, but the connection persists over so many varied populations that this seems unlikely. Mice also produce more male offspring during shorter days or colder weather, but the reasons in these animals are just as mysterious as they are in humans.
" There’s a possibility that humans might be responding to factors they were programmed to respond to a long time ago-not cultural or socioeconomic, but climate and things like latitude," Dr. Navara said. " What’s interesting is that we may be seeing something that connects us with our animal ancestry. "
Out of all the influencing factors of birth ratio, Dr. Navara focuses on______.
选项
A、culture
B、economy
C、latitude
D、stress
答案
C
解析
细节理解题。从第二段的“…and researchers have found a large variety of social,economic and biological factors that relate to the sex ratio at birth——war,economic stress,age,diet,selective abortion and more”可知,与出生婴儿的性别比例有关的社会、经济和生物因素,具体包括:战争、经济压力、年龄、饮食、选择性流产和其他因素。根据关键词Dr.Navara,我们返回到第三段找到相应的定位句:Kristen J.Navara of the University ofGeorgia…atbirth and annual variations in day length and temperature.由此可确定Kristen的关注点是latitude和data。根据以上内容,我们可确定答案为C。A项并未提及,B和D不是Navara关注的内容。
转载请注明原文地址:https://kaotiyun.com/show/ZNFO777K
0
考博英语
相关试题推荐
Nowadaysmoreandmorepeopleareinterestedinarrangingtimeforexercisesand____toreleasethestresscausedbythefastpac
Duringthereadinglesson,theteacheraskedstudentstoreadafew_____fromthenovel.
Inthecat-and-mousemaneuveringoveradmissiontoprestigiouscollegesanduniversities,【M1】thousandsofhighschoolshavesimp
Thisbookisabouthowthesebasicbeliefsandvaluesaffectimportant_____ofAmericanlife.
Overthepastfewyears,outcriesfromfoodactivistshavechangedmanyAmericans’eatinghabits-.Criticismofwidespreadpestic
Overthepastfewyears,outcriesfromfoodactivistshavechangedmanyAmericans’eatinghabits-.Criticismofwidespreadpestic
Ahundredyearsagoitwasassumedandscientifically"proved"byeconomiststhatthelawsofsocietymakeitnecessarytohave
FoodanddrinkplayamajorroleinChristmascelebrationsinmostcountries,butinfewmoresothaninMexico.Manyfamiliesov
Discoveredintheearly1800sandnamed’nicotianine’,theoilyessencenowcallednicotineisthemainactiveingredientoft
Thermoelectricmaterials______wasteheatintoelectricity,butoftenachievehighconversionefficienciesonlyhightemperatures
随机试题
着床(nidation)
(2019年聊城冠县)班主任工作的基本任务是带好班级和教好学生。()
除油器的作用是分离压缩空气中所含的_______、_______和_______等杂质,使压缩空气得到_______。
nonbeundwater
根据《农用地定级规程》的规定,修正法定级是在农用地分等指数的基础上,根据定级目的,选择()等因素计算修正系数,对分等成果进行修正,评估出农用地级别的方法。
逻辑框架法在(),主要用于判别项目是否与国家、地区或行业发展战略相适应。
()原则是一条具有中国传统文化特色的教学原则,它要求教师应认真了解和研究一个一个的具体学生。
在科学概念的学习过程中,引发与解决认知冲突,其目的是实现()
赵某与王某为邻居,常有口角。一天,由于王某养的羊吃了赵某菜地里的莱,赵某大怒,遂砍伐王某屋前的果树十棵。王某向乡派出所控告,乡派出所接到控告,经调查后,以县公安局的名义对赵某作出拘留5天的决定,并责令赵某赔偿王某200元。对此,下列说法中正确的是(
数据的物理结构在计算机存储空间中的存放形式称为数据的【】。
最新回复
(
0
)