Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Tropical rainforest is a forest of tall trees in a region of year-round （ ） and plentiful rainfall. (warm)
【正确答案】：WARMTH
【题目解析】：
本题考查的是常见形容词的名词形式。
year-round为形容词，且and后面也是形容词+名词的结构，故空缺处也应填名词，warm的名词形式为warmth意为“温暖”。
句意：热带雨林是一种地处全年温暖且降雨充沛的区域，拥有高大树木的森林。