There are ______ people and ______ noise here. I can’t stand it.
A:too much; too many
B:too; too
C:much; many
D:too many; too much
小明妈妈决定买国债,因为与金融债券、企业债券相比,国债更安全、利率也更高。( )
已知f(x)=x2+2(a﹣2)x+4,如果对x∈﹣3,1,f(x)>0恒成立,则实数a的取值范围为 ____.