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
Women’s fertility is determined in large part at birth. They are born with their total number of reproductive cells, which norma
Women’s fertility is determined in large part at birth. They are born with their total number of reproductive cells, which norma
admin
2015-10-20
77
问题
Women’s fertility is determined in large part at birth. They are born with their total number of reproductive cells, which normally influences the age at which menopause—the shutting down of female reproductive system—begins. But in the 1990s, researchers proposed that if a child’s energy is depleted by malnutrition, disease, or other factors, he or she would be less fertile as an adult. By using the natural experiment of migration, researchers demonstrated how differences during childhood do alter the course of reproduction in adult women.
Biological anthropologist Gillian Bentley of Durham University in the UK and colleagues compared levels of reproductive hormones in 250 Bangladeshi women, including women who migrated from Sylhet, Bangladesh to London; women who stayed in Sylhet; and Bangladeshi women bom in London. In the first stage of their study, they found that women who migrated from Bangladesh as children had higher levels of reproductive hormones in their saliva than women who lived in Sylhet, but less than women born in London. This had a direct effect on fertility: Migrant women in London had an 11% higher rate of ovulation—discharging of mature ovum—during their lives than did women in Sylhet, the team reported in 2007.
The team has now studied 900 women between the ages of 35 and 60 to see if the beginning of menopause varies between migrants and women in Sylhet. Bentley presented preliminary results from their measurement of hormones that regulate the maturation of reproductive cells and are indirect indices of how many ova they can still produce. Her team found that migrants enter menopause later than did women who stayed in Bangladesh but earlier than did those born in London. "The adult migrants seem to be sensitive to improved conditions," says Bentley.
The group is trying to find out which environmental factors in Bangladesh lower growing girls’ fertility. All the Bangladeshi women in the study came from middle-class, land-owning families, who grew up with adequate calories. However, girls growing up in Bangladesh were probably exposed to more infectious diseases during crucial developmental years. So, they may have had to make tradeoffs among using energy to grow, to maintain their bodies, or to maximize their reproductive potential as adults. Bentley plans to test that idea next year when her team returns to Bangladesh to see if girls there suffer from more diseases than do those in London. "In other words," says Bentley, "where you spend your childhood influences adult reproductive function."
In Paragraph 2, Gillian Bentley’s research showed us that
选项
A、women staying in Sylhet had a high level of reproductive hormones.
B、women born in London were less fertile than those migrates from Sylhet.
C、reproduction level of adult women varied in different regions.
D、where you spend your childhood might affect the fertility of adult women.
答案
D
解析
事实细节题。根据第二段可得知本特利研究的内容和结论是妇女由于生长环境的不同导致生育能力的不同。并且着重提到了这些研究对象童年的生长地,故选D。
转载请注明原文地址:https://kaotiyun.com/show/tNzZ777K
0
考研英语一
相关试题推荐
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
Youwillgraduatefromuniversityandintendtocontinueyourfurtherstudyoverseas.Writealettertoagraduateschoolto1)
In1939twobrothers,MacandDickMcDonald,startedadrive-inrestaurantinSanBernadino,California.Theycarefullychosea
In1929JohnD.Rockefellerdecideditwastimetosellshareswhenevenashoeshineboyofferedhimasharetip.Duringthepas
The"paperlessoffice"hasearnedaproudplaceonlistsoftechnologicalpromisesthatdidnotcometopass.Surely,though,th
ForalargenumberofyoungadultsinBritain,homeownershiphasbecomeincreasinglydifficulttoachieve,viewedasadistantg
[A]Notgivingbonustoemployeeswhodeserveit[B]Notgivingpositiveinformation[C]Notlinkingindividualjobstothebigpic
"AtBoozAllen,we’reshapingthefutureofcyber-security,"trumpetsarecruitingmessageonthewebsiteofBoozAllenHamilton
ReadersofacertainagecanrememberatimewhenatriptoMcDonald’sseemedlikeatreatandwhenasmallbagofFrenchfries,
随机试题
围产保健要求开始产前检查的时间为闭经
奥瑞姆护理学说的基本精神是研究人的
为了研究三种不同饲料对小鼠体重的影响,将30只同种鼠的小鼠按体重相近的原则分为10组,每组内的3只老鼠喂养饲料是随机分配的,30天后称量小鼠的体重。检验假设H0应为
下列表格中,不属于工程项目年度计划的是()。
制度化教育建立的典型表征是()
下列排序算法中,某一趟结束后未必能选出一个元素放在其最终位置上的是()。
自我意识发展的主要成分和主要标志是()。
雇佣童工从事危重劳动罪中“童工”是指()
PressureCooker(压力锅)SafetyWhenyouarecookingwithapressurecooker,youshouldlearnafewcommonsense(常识)rules:
A、7:00.B、7:30.C、8:00.D、9:00.B男士说,“我认为运动会8点开。”,女士说,“我们有半个小时的时间赶过去。”所以现在的时间应该是7:30。
最新回复
(
0
)