维生素A缺乏的临床表现是（ ）
A．干眼病
B．呆小症
C．贫血
D．坏血病
参考答案：A
As the popular saying _____, "Laugh and the whole world laugh with you. Cry and you cry alone." [ ]
A. speaks
B. goes
C. tells
D. talks
支气管哮喘发作禁用（）。
A.地塞米松
B.氨茶碱
C.沙丁胺醇
D.肾上腺素
E.吗啡
