语法与词汇 18.However, nothing has ever equaled the______and speed with which the human species is altering the physical and chemical world and demolishing the environment.
【正确答案】 D
【答案解析】本题考查名词辨析。根据空格后的and speed判断，空格处所填词应与speed并列，结合选项，magnitude(程度，规模)符合语义，故答案为[D]项。concern意为“关心，担心”。determination意为“决心，确定”。carelessness意为“疏忽，缺乏考虑；无忧无虑”。