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阅读下面短文，根据其内容写一篇60词左右的内容概要。 You may know all about vitamin C, but do you know whyvitamin D is also important to your body? Experts from the Children's Hospitalin Boston, US, have said that some teens don't get enough of this importantnutrient. Vitamin D can help bones and muscles grow strong andhealthy. If a person is short of vitamin D, he or she may have problems likerickets(佝偻病)and osteoporosis． Rickets is mainlyfound in children. Osteoporosis,the thinning of bone, is a common problem aspeople get older. Studies in these years have foun关于欧洲西部旅游景点的说法，正确的是（　　）A．英国的峡湾风光引人入胜B．伦敦的艾菲尔铁塔令人景仰C．南部地中海沿岸国家的海滨沙滩优美宜人D．芬兰的花卉尤其是郁金香闻名世界