题目

 _______Olympic torch has reportedly stayed alight throughout _____varied extreme weather conditions in a German testing center.    A. 不填; the             B. The; 不填                C. 不填; an                D. The; a 答案：B（2009•庆阳）若关于x的方程x2+2x+k-1=0的一个根是0，则k=    ．