如图为我国部分地区主要气象灾害发生频次统计资料，据图回答以下问题。

A single-parent child should have the right to enjoy normal parental love from both just as his other peers, which some psychologists see as _____to their emotional well-being.

已知定义域为R的函数f(x)满足：f(x+4)=f(x)，且f(x)-f(-x)=0，当$-2\le x<0$时，f(x)=2^-x，则f(2013)等于(   )

读“某区域人口分布”图，关于该地特征说法正确的是（　　）

两栖动物幼体生活在水中用____呼吸，成体生活在陆地用____呼吸．