变异性哮喘的特点是()
A.缓解后数小时再次发作
B.咳嗽可为惟一症状
C.哮喘伴有大量白色泡沫样痰
D.动时出现胸闷、咳嗽和呼吸困难
E.发作急、症状重
参考答案:B
Your coat is very good ______ the color. [A] except for [B] except [C] but