下列属于符号分析服务类工作的是（）
A.会计师
B.主妇
C.门卫
D.收银员
正确答案是A
It wasn't until the mid 20th century that doctors realised asthma attacks were caused by the swelling and contraction of the airways, Consequently, in the last 40 years there have been many devclopments in the treatment of asthma. There are presen
