银翘散的功用为（）
A.疏风清热，宣肺止咳
B.辛凉透表，清热解毒
C.辛凉宣肺，清热平喘
D.宣利肺气，疏风止咳
E.解肌清热透疹
参考答案：B
—I called you at 6 o'clock yesterday evening, but nobody answered.
—I'm sorry. I _______ my friend download the movie Kung Fu Panda Ⅱwhen the telephone rang, [ ]
A. would help
B. helped
C. was helping
丁溴东莨菪碱中枢作用较弱的主要原因是
A．其酯键易水解
B．具有环氧托晶烷的结构
C．具有季铵结构
D．具有游离羟基
E．具有分子立体构型
