男，50岁，发热伴咳嗽2周余，查体：皮肤、粘膜无黄染，无出血点，肝、脾不肿大，浅表淋巴结未扪及；血常规检查：Hb90g／L，PLT95×109／L，WBC3.0×109／L，GRU61％，LYM30％，E4％，M4％，中幼粒细胞1％，易见中性粒细胞核分叶过多。骨髓检查：有核细胞增生活跃，粒系48％，其中原粒细胞2％，早幼粒细胞4％，易见双核中、晚幼粒细胞及巨杆状核粒细胞，红系22％，其中巨幼样幼红细胞5％，易见有核红细胞核畸形，核碎裂，小巨核细胞可见。铁染色内外铁均增加，红系PAS染色弱阳性
要确定诊断，最有意义的检查是（）
A.血清铁和总铁结合力
B.骨髓组织病理检查
C.血清叶酸、维生素B检查和染色体核型分析
D.抗人球试验和酸溶血试验
E.NAP、NAE染色
参考答案：C
完形填空。阅读下面短文，选择最佳作案。（每小题1分，共10分） The Great Wall of China has a history of over two thousand years. It runs from the east to the west in North China . It is about 6,300 kilometers 46 . It is often 47 “The Ten-thousand- Li Great Wall”. It is one of the “Seven Wonders” of the ancient world. The Great Wall is 48 for ten men to walk side by side. Horses can also run along it, too. The Great Wall 49 stones and bricks(砖). There are huge stones on 50 side and on the highest part. But now some sections of it are worn out. There are tall watchtowers along the Great Wall. Once upon a time, the soldiers kept 51 the enemies(敌人) in the watchtowers day and night. They made 52 on the towers to 53 each other when the enemies came. Nowadays we don’t use the Great Wall to keep away the enemies any more. It is a famous place of 54 to all the people in the world. Every year 55 people come to visit it from all over the world.
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