You like surfing and chatting all night, too?Don't you think we have so much________?
A:in common
B:of common
C:on common
D:with common
汉武帝治国的核心思想来源于( )
已知a1+a2+…+a30+a31与b1+b2+…+b30+b31均为等差级数,且皆有31项.若a2+b30=29,a30+b2=﹣9,则此两等差级数的和相加的结果为多少?( )