能养胃阴、生津液，又能滋肾阴、清虚热的有效药物是
A．玉竹B．沙参C．石斛D．麦门冬E．天门冬
参考答案：C
When the teacher came in, all of us _______.[ ]
A. stopped talking
B. stopped to talk
C. stop talking
D. stop to talk
为什么说五四运动是中国新民主主义革命的伟大开端
