吗啡的主要作用是
A．抗菌B．抗痛风C．散瞳、解痉D．抗疟疾E．镇痛
参考答案：E
欧洲第一长河是（ ）
A．多瑙河
B．乌拉尔河
C．伏尔加河
D．尼罗河
As teachers, we should let our students do ______ to develop their interests. [ ]
A. whatever do they like
B. whatever they are like
C. whatever will they like
D. whatever they like
