的时候,引导时间状语从句,这里指"虽然我们从食物中获取维生素D,但我们也可以从太阳中获取它。",故选:B。虽然我们从食物中获取维生素D,但我们也可以从太阳中获取它。考查连词.要根据连词的含义和用法,进行比较,找出正确答案。反馈 收藏
解析 Although虽然;For为了;Because因为;If如果。根据we can get Vitamin D from food,we can also get it from the sun."...我们可以从食物中获得维生素D,我们也可以从太阳中获得。"可知,应该是"虽然",用Although引导让步状语从句。故选:A。反馈
aVitamin D3 (VD3) is either consumed in food or produced from 7-dehydrocholesterol in the skin upon exposure to unlight. In humans and other mammals. 维生素D3 (VD3)在食物在皮肤被消耗或由7脱氢胆甾醇被生产在对unlight的暴露。 在人和其他哺乳动物。[translate]...
them strong.When we are older,we still need vitamin D to keep our bones strong.Our bodies keep the vitamin D in our bones and teeth.Then we lose vitamin D as we work and exercise during the day.But our bodies can't make vitamin D.So we have to get it fr...
So, quick masterclass: Vitamin D is naturally produced in the body when the skin is exposed to UVB sunlight, but it doesn't work through glass - which means we need to look for other options. "Your body naturally produces vitamin D when it's directly exposed to sunlight containing ultravi...
“UVA light—which is often touted as a ‘safe’ way to tan—has no vitamin D benefit and is still associated with an increased risk for skin cancer,” explains Neff. “Only UVB exposure will trigger the conversion of the vitamin D precursor to sun-generated vitamin D3 that impacts bone...
(2010) Vita- min D intake from food and supplements among Ontario women based on the US Block food frequency ques- tionnaire with and without modification for Canadian food values. Can J Public Health 101, 318-321.Anderson LN, Cotterchio M, Boucher BA, Knight JA, Block T: Vitamin D ...
better than those contained in pills.Even thought the vitamins in supplements are synthesized to the exact chemical composition of naturally occurring vitamins,hey still don't seem to work as well.For this reason,when selecting a vitamin sup 研究表明您从食物得到您比在药片包含的那些吃好的大多...
Vitamin D levels and food and environmental allergies in the United States: results from the National Health and Nutrition Examination Survey 2005-2006. L. Vitamin D levels and food and environmental allergies in the United States: results from the national health and nutrition examination survey ...
Our objective was to validate vitamin D intake from a short vitamin D questionnaire (VDQ) and a longer online food frequency questionnaire (FFQ) against a food record and 25-hydroxyvitamin D (25OHD) as a biomarker of vitamin D status, among pregnant women in Sweden. The number of women in...