某矿山营养调查发现，约35%的矿井下工人存在口角发白，口腔溃疡，阴囊皮炎，视物模糊或傍晚视物不清等症状。近期为了赶生产进度，劳动负荷增大，矿井下温度高，通风不良，且最近伙食较差，经常是大白菜、萝卜、肥肉。
出现此症状最可能的原因是（）。
A.维生素C和维生素B1缺乏
B.烟酸缺乏
C.蛋白质和热能缺乏
D.维生素B2和维生素A缺乏
E.能量和维生素缺乏
参考答案：D
Marc sat next to me when we were in Hill Junior School. He had a serious in communicating with people. One always had to guess what he was saying. , most of my classmates did not like to be with him because his hands and shirts were always . I tried to let him know the importance of being clean by him several times a day to wash his hands. But he just could not understand. One day, our teacher Miss West walked up to Marc. saying anything, she took Marc to the washroom. Slowly, Miss West washed his and told him that he should keep himself clean. She did that every day for one month. , Marc understood. Miss West's love has given me a good example to follow when I my job. I always remember to teach my students by showing them the right to do things. And most important of all, I always remember to give them to learn and to grow up.
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