常用的肠溶性载体材料为
A．聚乙二醇B．胆酸C．醋酸纤维素酞酸酯D．乙基纤维素E．甘露醇
参考答案：C
Children at the beginning of last century were ______to the life without television.
[ ]
A. disappointed
B. accustomed
C. puzzled
D. harmful
与喉癌发病有关的因素为（）
A.吸烟
B.饮酒
C.空气污染
D.性激素
E.病毒感染
