营养不良常见于（）
A.1岁以下小儿
B.2岁以下小儿
C.3岁以下小儿
D.5岁以下小儿
E.8岁以下小儿
参考答案：C
It's surprising that your brother _____ Russian so quickly-he hasn't lived there very long. [ ]
A. picked up
B. looked up
C. put up
D. made up
对于急性腹痛病人在观察期间应（）.
A、可用镇痛剂止痛
B、禁止使用镇痛剂
C、注射杜冷丁
