若方程x2-2x+m=0有两个实数根，则m的取值范围是（ ）。
Quite a few people were injured or killed in this traffic accident last week, ________?
A．were they
B．did they
C．weren’t they
D．didn’t they
南朝规模最大的一次立法活动是（）。
A.宋对律、令、科的修撰
B.齐对律、令、科的修撰
C.梁对律、令、科的修撰
D.陈对律、令、科的修撰
