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
69
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
StrangethingshavebeenhappeningtoEngland.Still【1】fromthedissolutionoftheempireintheyears【2】WorldWarⅡ,nowtheEn
StrangethingshavebeenhappeningtoEngland.Still【1】fromthedissolutionoftheempireintheyears【2】WorldWarⅡ,nowtheEn
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
In1929JohnD.Rockefellerdecideditwastimetosellshareswhenevenashoeshineboyofferedhimasharetip.Duringthepas
Nowthat2012isover,theWallStreetJournalisponderingwhetherthee-readereraiscomingtoanend.Althoughthestorysto
It’sGroundhogDayattheUSPostalService:timeonceagainforthefamiliarlamentsabouthowtheagency’sfinanciallossesar
It’sGroundhogDayattheUSPostalService:timeonceagainforthefamiliarlamentsabouthowtheagency’sfinanciallossesar
Anumberofethicalquestionsclusteraroundbothendsofthehumanlifespan.Whetherabortionismorallyjustifiablehaspopul
Everyday,employeesmakedecisionsaboutwhethertoactlikegiversorliketakers.Whentheyactlikegivers,theycontribute
随机试题
以下指资产评估结论是为资产业务提供的专业化估价意见的是()
下列血常规检查部分中哪项异常( )
如果物资验收入库的同时支付货款,则通过“应付账款”账户核算;如果物资验收入库后仍未付款,则按发票账单金额通过银行存款核算。()
在下列乘数中,是正值的乘数有()。
企业仓储管理的主要任务有()。
根据合伙企业法律制度的规定,下列情形中,属于有限合伙人当然退伙的有()。
下列关于中西人际关系文化差异的表述中,错误的是()
过程能力指数不包括()。
在下列著名的园林中,不是以假山著称的是()。
在美国纽约,有这样一种有趣的现象。每天晚上,总有几个时刻,城市的用水量突然增大。经过观察,这几个时刻都是热门电视节目间隔中插播大段广告的时间。而用水量的激增是人们同时去洗手间的缘故。以下哪项作为从上述现象中推出的结论最为合理?
最新回复
(
0
)