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
2015-07-13
21
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. Byusing 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 born 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项。
转载请注明原文地址:https://jikaoti.com/ti/79FRFFFM
0
考研英语一
相关试题推荐
Researchersarefindingthatboysandgirlsreallyarefromtwodifferentplanets.Boysandgirlshavedifferent"crisispoints"
Publicimagereferstohowacompanyisviewedbyitscustomers,suppliers,andstockholders,bythefinancialcommunity,bythe
Publicimagereferstohowacompanyisviewedbyitscustomers,suppliers,andstockholders,bythefinancialcommunity,bythe
TheAmericaneconomyisgrowing,accordingtothemostrecentstatistics,atthehighrateof7%,andisinthemiddleofthel
Wow!Womennowmakeup57percentofuniversityentrants,andtheyoutnumbermenineverysubject—includingmathsandenginee
Inthelate1960’s,manypeopleinNorthAmericaturnedtheirattentiontoenvironmentalproblems,andnewsteel-and-glassskysc
Nowmedicalresearchersarediscoveringatruism:"alcoholandtobaccodonotmix."Thesetwosubstances,bothdangeroustoheal
Oneofthemosteminentofpsychologists,ClarkHull,claimedthattheessenceofreasoningliesintheputtingtogetheroftwo
ResearchersledbyNewYorkUniversityneuroscientistJosephLeDouxrecentlyclaimedtobethefirstscientiststoeraseasingl
Inthe1960spopwasayoungperson’sbusiness.Buttodayageisnobarriertosuccess.TheRollingStonesarestilltouringin
随机试题
血管外破坏红细胞的主要场所是
在ASP.NTE中,利用CodeSmith工具数据库访问组件的()属性能够获取所有外键列的集合。
影响口腔生态系的内源性营养不包括
患儿男,1/2岁。出生数月后发现发育延迟,烦躁,反应迟钝,皮肤白皙,头发淡黄,虹膜蓝色。体格检查:四肢肌张力增高,震颤,腱反射亢进,共济失调,合并湿疹,4个月时曾有癫痫发作。其治疗方法为
上体前屈时腹痛明显,直立位时减轻,提示何种疾病
患儿,8个月,因肺炎入院,现突然烦躁不安,发绀,且进行性加重。体检:呼吸60次/min,脉搏170次/min,心音低钝,两肺布满细湿啰音,诊断为肺炎合并心力衰竭。若给患儿用强心苷,预防中毒的重要措施是
工期超过一年的建设工程,申领建设工程施工许可证,其到位资金原则上不得少于工程合同价的()。
竹枝词是风土诗的一种,保存了大量有价值的第一手资料。如要研究近代上海开埠后的商业活动,可选用的竹枝词是()。
Familysupportisimportanttochildren’semotionaldevelopment,especiallythefather,______(也许大部分人都觉得这不足为奇).
中国政府的独生子女政策(OneChildPolicy)是在1978年才实施(beputintoeffect)的。相对而言,时间是比较近的。因此,1978年前出生的人很可能有一个或更多的兄弟姐妹(siblings)。该政策并不意味着对每个人都平等,对
最新回复
(
0
)