参考答案：D

解析：同义辨析。climate气候；态度；风气；思潮；倾向：They know nothing about the present political climate．他们对当前的政治气候一无所知。atmosphere气氛；情绪：An atmosphere of tension filled the room．屋子里笼罩着紧张的气氛。sky天气；气候：I like the sunny skies of Italy．我喜欢意大利的晴朗天气。weather天气；气象：The weather is very changeable．天气变化无常。