方程x2+2x-3=0的解是( )
A:x1=1,x2=3
B:x1=1,x2=-3
C:x1=-1,x2=3
D:x1=-1,x2=-3
下列计算中,正确的是( )
“李宗仁指挥中国军队歼敌一万多人,取得抗战以来的重大胜利。”请判断这是什么战役( )
① Time for breakfast. ____ A. Sing and dance.
② Time for PE class____ B. Drink some milk.
③ Time for English class ____ C. Read and write.
④ Time for music class. ____ D. Jump and run.