This is ______ English book.______book is very useful (有用的) for your study.[ ]

A. an; A    

B. an; The    

C. a; A

患者产后乳汁甚少， * * 下垂不胀满，乳汁不稠，形体肥胖，胸闷痰多，纳少便溏，舌淡胖，苔腻，脉沉细。其证候是（）

A.痰浊阻滞证

B.湿浊中阻证

C.肝郁气滞证

D.气血虚弱证

E.脾肾两虚证