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
Taking a multivitamin around the time of conception may help women lower their risk of delivering low-birth-weight babies, a new
Taking a multivitamin around the time of conception may help women lower their risk of delivering low-birth-weight babies, a new
admin
2016-08-02
58
问题
Taking a multivitamin around the time of conception may help women lower their risk of delivering low-birth-weight babies, a new research shows. The study, one of the first to look at multivitamin use immediately before and after conception, strengthens the notion that nutritional deficiencies may increase the risk of birth complications.
Still, the researchers cautioned that it was too soon to recommend multivitamins for women who are contemplating pregnancy or already expecting. While some studies have suggested benefits, others have found that women who eat a healthy diet have no need for multivitamins, and that vitamins may even do some harm, especially when their use is continued late into a pregnancy.
The study, published in the September issue of The American Journal of Clinical Nutrition, analyzed data on nearly 36,000 Danish women enrolled in a national birth registry. The scientists who carried out the research found that a large share of the women—about 60 percent had been taking multivitamins in the four weeks before and eight weeks after the last menstrual period. After adjusting for a number of risk factors, like smoking, weight and the age of the mother, the study found that women who took a daily multivitamin and were of normal weight had a nearly 20 percent lower chance of delivering a preterm baby, compared with those who did not take a daily multivitamin. Women who were overweight did not see the same benefit, though it was unclear why.
In 2004, a study by scientists at Emory University and the Centers for Disease Control and Prevention found that taking daily multivitamins was a widespread practice among expectant mothers in the United States. Up to 78 percent of pregnant women reported taking multivitamins, the study found, compared with only 47 percent of women who were not pregnant.
Doctors have long encouraged pregnant women and those contemplating pregnancy to take folic acid—a B vitamin—daily to help prevent neural tube defects. Folic acid is the synthetic form of folate, a member of the family of B vitamins that is involved with DNA synthesis and DNA methylation. Because of these crucial functions, folate plays important roles in fetal development and nerve tissue health. And since the late 1990s, the government has also required food makers to add the vitamin to many grain products, including flour and breads. The authors of the latest study suggested that there could be other nutrients in multivitamins besides folic acid that help reduce the risk of birth complications. But they also said that more, research was needed, and that they were not recommending that women trying to conceive should start a daily multivitamin regimen.
Folate plays important roles in______.
选项
A、DNA synthesis and DNA methylation
B、lowering the chance of delivering a preterm baby
C、fetal development and nerve tissue health
D、avoiding vitamin B deficiency
答案
C
解析
本题考查考生对最后一段有关维生素里面叶酸这一成分作用的理解。题目有两个关键点.一个是在哪个方面发挥作用,另一个是在这个方面发挥了重要作用,这二者缺一不可。A项DNA的合成和DNA甲基化,文中确实提到叶酸参与DNA的合成和DNA甲基化,但是只是参与,不能得出扮演重要角色,发挥重要作用。因此不正确。B是错误结论,最后一段提到多种维他命中,可能还有其他除叶酸以外的营养成分,能帮助减少分娩并发症的风险,可见叶酸可以帮助减少分娩并发症的风险,但是并没有降低产出早产儿几率,因此B不正确。D属于片面引申,叶酸是维生素B的一种.单单就补充叶酸来说.并不能避免维生素B的缺乏,因此D也不正确。最后一段明确指出由于这些重要的功能,叶酸在胎儿的发育和神经组织的健康方面起着重要的作用,因此C是正确答案。
转载请注明原文地址:https://kaotiyun.com/show/M6oZ777K
0
考研英语一
相关试题推荐
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse:
Itisafamiliarscenethesedays:employeestakingnewlylaid-offcoworkersoutforacomfortdrink.Butwhichsidedeservessy
Theenergycrisis,whichisbeingfeltaroundtheworld,hasdramatizedhowtherecklessdespoilingoftheearth’sresourceshas
Theenergycrisis,whichisbeingfeltaroundtheworld,hasdramatizedhowtherecklessdespoilingoftheearth’sresourceshas
MercedesestatecarsandFiatrunaroundsarebeingusedtotestupto22differentmonitorsdesignedtodetectifadriverisfa
MercedesestatecarsandFiatrunaroundsarebeingusedtotestupto22differentmonitorsdesignedtodetectifadriverisfa
MercedesestatecarsandFiatrunaroundsarebeingusedtotestupto22differentmonitorsdesignedtodetectifadriverisfa
随机试题
患儿,5岁,心跳、呼吸骤停,值班护士小王和小张立即为其行心肺复苏。抢救该患儿时,胸外心脏按压和人工呼吸的比例应为
甲(男)、乙(女)结婚后,甲承诺,在子女出生后,将其婚前所有的一间门面房,变更登记为夫妻共同财产。后女儿丙出生,但甲不愿兑现承诺,导致夫妻感情破裂离婚,女儿丙随乙一起生活。后甲又与丁(女)结婚。未成年的丙因生重病住院急需医疗费20万元,甲与丁签订借款协议从
按照JJF1059.1—2012中的规定,评定被测量估计值的测量不确定度的方法可以有_____________。
“一生二,二生三,三生万物;地法天,天法道,道法自然”题联写于()。
江南古典园林中孤立的石峰为了取得“瘦、皱、漏、透”的效果,一般以()为石材。
殿试按成绩分为一甲三名,从第一名到第三名分别称()。
警务公开的方式主要有()。
A、 B、 C、 D、 C横着看,首先观察“嘴”的变化,应选择一个呈“笑”态的,所以排除D选项;再看“眼睛”的变化,一对全白,二对呈一黑一白,所以应该排除B选项(一黑一白);再看“耳朵”的变化,显然二只“耳朵
在天津某单位工作的杨洋需要向上级部门提交一份最新的中国互联网络发展状况统计情况,他便从网上下载了一份资料,但这份资料比较零乱,需要经过整理后才能提交。请你按下列要求帮他完成该文档的整理工作:在前言内容和报告摘要之间插入自动目录,要求包含标题第1~3级及
Afterthefailureoffrostytalks,anall-outwarispossibletobreakoutbetween______.
最新回复
(
0
)