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
37
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."
According to the text, which of the following factor in childhood will probably cause an adult to be less fertile?
选项
A、Menopause period.
B、Infectious disease.
C、Vigorous exercise.
D、Reproductive hormones.
答案
B
解析
推理判断题。根据第一段第三句话可得知使妇女生育能力下降的因素包括因营养不良、疾病或其他因素,B项包括在内,故选。
转载请注明原文地址:https://kaotiyun.com/show/kNzZ777K
0
考研英语一
相关试题推荐
StrangethingshavebeenhappeningtoEngland.Still【1】fromthedissolutionoftheempireintheyears【2】WorldWarⅡ,nowtheEn
Thequestionofwhereinsightscomefromhasbecomeahottopicinneuroscience,despitethefactthattheyarenoteasytoindu
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
Thekeypositionandroleofwomenintheprocessofdevelopmentisincreasinglybeingrecognized.(1)_____thethreegreatWorl
It’sGroundhogDayattheUSPostalService:timeonceagainforthefamiliarlamentsabouthowtheagency’sfinanciallossesar
It’sGroundhogDayattheUSPostalService:timeonceagainforthefamiliarlamentsabouthowtheagency’sfinanciallossesar
[A]Notgivingbonustoemployeeswhodeserveit[B]Notgivingpositiveinformation[C]Notlinkingindividualjobstothebigpic
"AtBoozAllen,we’reshapingthefutureofcyber-security,"trumpetsarecruitingmessageonthewebsiteofBoozAllenHamilton
随机试题
一般宜在春末夏初采收的中药是
全国口腔健康调查技术组专家对某省调查人员进行了调查前培训,纠正了一些容易影响调查质量的不足之处。用牙周CPITN指数只检查6颗指数牙的年龄应在
风寒袭肺型喘证的治则是水凌心肺型喘证的治则是
建设工程设计,是指根据建设工程的要求,对建设工程所需的()等条件进行综合分析、论证、编制建设工程设计文件的活动。
根据《预算法》的规定,预算收入包括()。
中学生学习动机的特点有()
北斗卫星导航系统是我国具有自主知识产权的导航系统,它已开始运行,并向大部分地区正式提供()的区域服务。
在处理所谓外部引进人才——“空降兵”与内部培养人才——“子弟兵”的关系上,有许多企业倾向于给引进人才更多的关注,主要是给予更高的薪金与福利待遇,结果在无形中挫伤了内部培养人才的积极性。对于产生这种情况的原因存在以下几种说法,你认为其中哪种说法最具说服力?(
行政诉讼中,两个以上的行政机关作出同一具体行政行为的,()行政机关是被告。
下述关于数据库系统的叙述中正确的是()。
最新回复
(
0
)