下列各组数中,数值相等的是( )
A:34和43
B:-42和(-4)2
C:-23和(-2)3
D:(-2×3)2和-22×32
It was very cold yesterday. But today is even ____ (cold)
我国水旱灾害频繁的根本原因是( )
如图所示为叶片横切面结构图,小小的叶片中包含了植物体主要的三种组织,请据图回答