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
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies
admin
2015-07-13
25
问题
Parents of children who happily eat what’s put in front of them might assume their kids are well nourished. But two new studies drive home the importance of varying that diet. Deficiencies of vitamin D, omega-3 fats, and other healthful compounds are common; it turns out—and consequential.
Growing evidence links vitamin D deficiency not only to weak bones but al-so to impaired immunity, asthma, and diabetes among other problems. And some of the latest research finds that rates of asthma and related respiratory problems climb in kids who are short on other commonly missing essentials, including vitamins C and E and omega-3 fatty acids.
A team at the Harvard School of Public Health evaluated the diet and respiratory (relating to the process of breathing) health of some 2,000 North American high school seniors and found that teens who lack of fruit, vegetables, and other healthful foods were most likely to have problems such as coughing, panting, episodes of bronchitis, and asthma.
Vitamins C and E, which are abundant in fruit and dark-green vegetables, may "protect the lung from stress," says Harvard research fellow and study leader Jane Burns. Omega-3 reduces inflammation, a key feature of asthma, in which airways swell and make breathing difficult. Oily fish like salmon, mackerel, and tuna—as well as cod-liver oil—are rich in both omega-3 and vitaminD Vitamin D can also be obtained from multivitamin milk and sunshine—and many kids should be getting more of both.
In another new study, researchers found that 55 percent of outwardly healthy children and teenagers they tested didn’t have enough vitamin D to grow healthy bones. Dark-skinned children were particularly likely to be short of the bone-building vitamin, according to Babette Zemel, an author of the study and director of the Nutrition and Growth Laboratory at Children’s Hospital of Philadelphia. The melanin (a natural dark brown colour in human skin, hair, and eyes) that makes their skin dark also blocks ultraviolet rays, which the body uses to make vitaminD In winter, when the sun was weakest, more than 90 percent of blacks in the study were vitamin D deficient.
Researchers suggest pointing kids outside, and waiting a few minutes before putting on sun block; 10 minutes of midday summer sun provides 10,000 international units of the vitamin—more than enough for a day. Like melanin, sunblock prevents the skin from making vitamin D, so a bit of lotion-free exposure is necessary to grab the benefit.
According to the text, dark-skinned kids are particularly short of vitamin D in that the dark skin_____.
选项
A、has more melanin that consumes more vitamin D
B、absorbs more ultraviolet rays, thus killing the melanin
C、can only produce units of the vitamin when the sun was strong
D、has more melanin that blocks ultraviolet rays, reducing vitamin D production
答案
D
解析
事实细节题,考查因果细节。根据题干的dark-skinned kids定位到第五段。该段讲到黑色素同时也阻挡紫外线,而紫外线是人体合成维生素D的来源。故选D。
转载请注明原文地址:https://jikaoti.com/ti/OQFRFFFM
0
考研英语一
相关试题推荐
Theclassicdifficultyfeltwithdemocracyarisesfromthefactthatdemocracycanneverexpressthewillofthewholepeoplebe
Inthelate1960’s,manypeopleinNorthAmericaturnedtheirattentiontoenvironmentalproblems,andnewsteel-and-glassskysc
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontributingtoglobalwarming,havefallenby14percent
ResearchersledbyNewYorkUniversityneuroscientistJosephLeDouxrecentlyclaimedtobethefirstscientiststoeraseasingl
Aschildhood-obesityratesskyrocket,doctorsareseeinganalarmingriseinacostlydiseaseonceunheardofinchildren;type
Thereisnothinglikethejoyoffindingoutthatsomethingsinfulisactuallygoodforyou,whetherit’ssex,chocolateoragl
Thereisadifferencebetweenscienceandtechnology.Scienceisamethodofanswering【B1】______questions;technologyisametho
Thereisadifferencebetweenscienceandtechnology.Scienceisamethodofanswering【B1】______questions;technologyisametho
Publicserviceannouncementsdonatedbyradio,print,televisionandInternetmediawillattempttoconvincekidsandtheirpare
Foodistotheblood______readingistothemind.
随机试题
执行下面程序段的输出结果为()。publicclassQ{publicstaticvoidmain(Stringargv[]){intanar[]=newint[5];System.out.println(an
男,6岁,身高80cm,智能落后,仅能数1~20个数。体检:皮肤粗糙,眼距宽,鼻梁宽平,舌宽厚,常伸于口外,毛发枯干,发际低,骨龄摄片仅有4枚骨化核。患儿确诊后治疗应选用
A.水冲脉B.交替脉C.脉搏短绌D.重搏脉E.奇脉主动脉瓣关闭不全可出现的脉搏是()
某啤酒厂(增值税一般纳税人)2019年2月销售A型啤酒20吨给副食品公司,开具税控专用发票收取价款58000元,收取包装物押金3000元;销售B型啤酒10吨给宾馆,开具普通发票取得收入32760元,收取包装物押金1500元。该啤酒厂应缴纳的消费税是(
下列表述正确的是()。
Thisnoticeconcernsallemployeeswhousetheconferencerooms.Startingimmediately,youwillneedt0officiallyreserveanyconf
2018年7月,教育部印发《关于开展幼儿园“小学化”专项治理工作的通知》,针对一些幼儿园的“小学化”倾向提出了多项治理任务。何谓幼儿园“小学化”?有学者认为大致包括:1.在教育内容上重视智力教育,而轻视德、体、美、劳的生活学习体验;2.在教育方法
下列选项中,关于网络运行环境的描述不正确的是()。
为了使每秒钟发生一次计时器事件,可以将其Interval属性设置为( )。
Whenitcomestotheslowingeconomy,EllenSperoisn’tbitinghernailsjustyet.Butthe47-year-oldmanicuristisn’tcutting,
最新回复
(
0
)