母乳中可促进乳酸杆菌生长的物质有（）
A.乙型乳糖
B.锌、铁
C.双歧因子
D.低聚糖
E.维生素B
参考答案：A, C, D
He was unlucky because he failed the exam.
A．He was bad because he failed the exam.
B．He was lucky because he passed the exam.
C．He was unhappy because he failed the exam.
D．He was not lucky because he failed the exam.
固定性湿啰音（）
A.支气管哮喘
B.支气管扩张
C.喘息型慢性支气管炎
D.支气管肺癌
E.浸润型肺结核
