The only safe way of distinguishing between edible and poisonous mushrooms is to learn to______the individual species.
【正确答案】
A
【答案解析】本题空格处是说学会识别单独的种类。A项identify“识别”符合题意，如：The markings are so blurred that it is difficult to identify．(标记模糊不清，难以识别。)其他三项classify“分类”，isolate“使孤立”，separate“分离”都不正确。