李某最近一段时间皮肤粗糙，一到夜晚看不清物体，那么他的饮食中应适量增加下列哪些食物（ ）
A．动物肝脏、胡萝卜、黄玉米
B．花生、奶油、蛋黄
C．豆类、糙米、全粒谷物
D．水果、新鲜蔬菜
维生素的种类很多，其功能和缺乏症如图所示：
可见，感觉视力疲劳，夜晚看不清东西等是夜盲症的表现，夜盲症和皮肤粗糙是因为缺乏维生素A引起的，维生素A主要在动物的肝脏中含量丰富，植物性食物中一般不含维生素A，但是胡萝卜等植物性食物里含有大量的胡萝卜素，它们在人体肝脏内能转变成维生素A，李某最近一段时间皮肤粗糙，一到夜晚看不清物体，应该是夜盲症，应该多吃动物肝脏、胡萝卜、黄玉米等．可见A正确．
故选：A
Happy birthday The China Nation Opera (CNO)will give a concert to celebrate its 50th birthday. Different generations of CNO vocalists(歌手), like Li Guangxi, Yao Hong and Ma Mei, will present the concert which will feature both songs from famous Chinese operas like “The White-haired GM “and “The Hundredth Bride”, as well as, arias (咏叹调) of such Western opera classics as “Madame Butterfly”, “La Traviata” and “Rigoletto”. Time/date : 7:30 pm, September 7, 8 Location : Tianqiao Theatre Tel : 6551-4787, 8315-6170 Tickets : 60—50 yuan (US $7.2-60.2) Folk music A concert will be held to feature some recently-composed traditional Chinese music works. The concert, given by the Folk Orchestra of the China Opera and Ballet Theatre, will include such pieces as “Memory of Childhood”, “Memorial Ceremony for God” and “Wine Song”. Time/date : 7:30 pm, September 13 Location: Concert hall at the National Library of China Tel: 6848-5462, 6841-9220 Tickets : 30-200 yuan (US $ 3.6—24.1) Moon music A concert of traditional Chinese music will be given on the eve of the Moon Festival which falls on September 21st this year. The concert will feature a number of famous pieces centered on this theme of the moon, such as “Moonlight”, “Spring Night on a Moonlit River” and “Lofty Mountain and Flowing River.” A number of established traditional Chinese music performers, like Zhou Yaokun and Fan Weiqing, will play solos（独奏）as well as collaborate（合奏）with the folk music orchestra. Time/ date: 7:30 pm, September 21st Location: Grand Theatre of the Cultural Palace of Nationalities Tel: 6606-8888, 6606-9999 1. If you want to buy tickets for listening to the music “Memory of Childhood”, you will dial .
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