慢性再障的治疗首选()。
A.抗胸腺球蛋白
B.丙酸睾酮肌内注射
C.造血干细胞移植
D.维生素B12肌注
E.肾上腺糖皮质激素口服
参考答案:B
Though he failed many times in election, he never lost______ heart and at last he was elected_______ President of the USA.
A. the ; a B. a ; the C. his; the D. / ; /
线形动物门的主要特征是:身体______,消化管前端有______后端有______体表有 。