题目

已知p：方程方程 +=1表示焦点在y轴上的椭圆；q：实数m满足m2﹣（2a+1）m+a2+a＜0且￢q是￢p的充分不必要条件，求实数a的取值范围． 答案：解：由p可得：2﹣m＞m﹣1＞0，解得． 由q：实数m满足m2﹣（2a+1）m+a2+a＜0化为：（m﹣a）[m﹣（a+1）]＜0， 解得a＜m＜a+1．又￢q是￢p的充分不必要条件，∴p⇒q． 则，解得．经过检验a=或1时均适合题意． 故a的取值范围是．I am afraid he's more of a talker than a doer, which is __________ he never finishes anything. A. that B. whenC. where D. why