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
More boys than girls arc born all over the world, but a new study has found that the closer people live to the equator, the smal
More boys than girls arc born all over the world, but a new study has found that the closer people live to the equator, the smal
admin
2016-08-02
43
问题
More boys than girls arc born all over the world, but a new study has found that the closer people live to the equator, the smaller the difference becomes. No one knows why.
The skewed 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 correlate with it—war, economic stress, age, diet, selective abortion or infanticide and more. Teasing out the contribution of any single cultural or political variable has proved an almost infinitely complicated exercise.
But latitude is a natural phenomenon, unaffected by cultural or economic factors. To look at its effect, 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.
To estimate socioeconomic status for each country, she used statistics on unemployment and gross national product. She also calculated a political instability index using an analysis of stale failure and conflict published by the Fund for Peace, a research organization that combines 12 social, economic and political indicators to estimate the relative stability of the world’s nations.
Then Dr. Navara performed a statistical analysis to figure out which variables affect sex ratio. The report appeared online April 1 in Biology Letters.
The number of boys born was not related to socioeconomic and political factors, but there was a significant correlation between sex ratios skewed in favor of boys and latitude and the climate variables that go with it. African countries produced the lowest sex ratios—50. 7 percent boys and European and Asian countries had the highest with 51. 4 percent.
The effect of latitude, Dr. Navara found, persisted across wide variations in lifestyle and socioeconomic status. There were large differences in sex ratio between tropical regions within 23 degrees of the equator and the temperate regions 23 to 50 degrees north or south, but no difference between the temperate regions and the subarctic north of 50 degrees. The population of people living south of 50 degrees was too small to be included in the analysis.
The correlation with latitude was unchanged even after excluding data from Asian and African countries that might have been skewed by abortion or the killing of baby girls. So sex selection by parents before or at birth does not explain the correlation.
According to a new study. ______.
选项
A、sex ratio is determined by where people live
B、sex ratio at birth is skewed all over the world
C、the skewed sex ratio is a natural phenomenon
D、the percentage of boys born varies with latitude
答案
D
解析
根据第一段中的“…a new study has found that the closer people live to the equator,thesmaller the difference becomes”可知,新生男孩与女孩的比例随纬度变化,也就是。新生男孩的百分比随纬度变化。所以,D应为答案。
转载请注明原文地址:https://kaotiyun.com/show/z1oZ777K
0
考研英语一
相关试题推荐
FromthefoundingofHarvardCollegein1636untiltheCivilWar,Americanuniversityeducationwasmostlyaboutsendingpiousa
Geniusissaidtohavetwoforms.Thereareordinarygeniuses,whoseachievementsonecanimagineothersmighthaveemulated,so
TheRomanticMovementemphasizedthecreativeartistratherthanthenaturalworldastheoriginofbeauty.【F1】Accordingtothe
Foraquarterofacentury,surveysofreadinghabitsbytheNationalfortheArts(NEA),afederally-fundedbody,havebeenfav
Don’ttalk:yourcellphonemaybeeavesdropping.Thankstorecentdevelopmentsin"spyphone"software,ado-it-yourselfspook
Athleteswhocheatbyinjectingthemselveswithstoredsuppliesoftheirownbloodmightsoonbecaughtout.Arevealingtrailo
Thetranslatormusthaveanexcellent,up-to-dateknowledgeofhissourcelanguages,full【C1】______inthehandlingofhistarget
Cultureinfluencesanindividual’shealthbeliefs,behaviours,activitiesandmedicaltreatmentoutcomes.【C1】______thesignifica
Somepeoplearefriendlydrunks,whereasothersarehostile,potentiallyposingadangertothemselvesandothers.Thedifferenc
Alcoholmaytastesweeterifyouwereexposedtoitbeforebirth,suggestsastudyinrats.Thefindingsmayshednewlight【C1】_
随机试题
关于免疫抑制剂OKT3(单抗)的叙述,下列哪项不正确
关于十二指肠的描述,错误的是
采用缩小扫描野的CT扫描方式是指
用于治疗肝胆湿热所致的黄疸,面目悉黄、胸肋胀痛、恶心呕吐、小便黄赤等症的中成药是
沥青与矿料粘附性试验试用于评定集料的()。
为了提高光学仪器的分辨本领,通常可以采用的措施有()。
中华人民共和国全国人民代表大会于2017年3月15日通过了《民法总则》,尤其值得关注的是新加入的“个人信息”权与确立“数据”等虚拟财产保护的条款。这一条款保障了公民的()。
某国劳工部宣布,2月份该国业率跌至7,7%,是自2008年以来的最低值,在失业率下降的同时,数据还表明,新增就业人数也出现了大幅增长。这个消息极大地鼓舞了市场,银行开始提供更多信贷,商业投资正在增长。但也有专家提出应该警觉,对经济复苏不要过度自信和乐观。以
不可以在Excel工作表中插入的迷你图类型是()
Rumorshaveswirledforyearsaboutthemysticalphone,whichFacebookintroducedatitsheadquarterstoday.Forthefinancials
最新回复
(
0
)