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】：
根据前文的year-round形容词和后文的and加名词，可知空格处应该填名词形式，因为and前后格式应该一致，warm的名词形式为warmth，且符合句意。句意：热带雨林是一片长满树木的森林，终年温暖，雨量充沛。