A:{xx<1}
B:{}
C:{x-1x1}
D:{x-1x<1}
下列实例中属于竞争的是( )
中国农民说:“吃饭靠两平,一是邓小平,二是袁隆平。”袁隆平的突出贡献是( )
I ____(know) him ever since I was a child.