— I suppose you are at least 60 years old.— Thank you. I'm glad you______ that. My real age is 62.
A:say
B:said
C:are saying
D:were saying
已知函数f(x)=﹣x2+ax+b(a,b∈R)对任意实数x都有f(1+x)=f(1﹣x)成立,若当x∈﹣1,1时f(x)>0恒成立,则b的取值范围____
①五四运动扩展到上海 ②学生是运动的先锋 ③工人已经举行浩大罢工 ④运动具有反帝反封建性质