下列哪些药物具有舒张支气管作用（）
A.茶碱
B.β受体阻滞剂
C.胆碱能受体激动剂
D.β2受体激动剂
E.β1受体激动剂
参考答案：A, D
《开罗宣言》
—I'm sorry I _ _ _ my homework at home.
—That's all right. Don't forget it to school tomorrow. [ ]
A. forget, to take
B. forget, to bring
C. left, to take
D. left, to bring
