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它们可能不知道飞行的方向。28.D细节理解题。根据第二段“..turn their backs to the sky's light to keep their feet pointing toward theground.Insects naturally turn their backs to ward light.But when that light is from an artificial source,it may affecttheir sense of direction,leading to them flying in circles or diving toward the ground.”可知，飞虫自然地背对光飞行是为了追踪地面在哪。29.A细节理解题。根据第三段“.Some circled the lights endlessly,and others flew sharply upward,,lo singspeed until they couldn't fly any higher.When the light source pointed up,some insects turned around and headedfor the ground.During flight,the insects always kept the lights at their back even if they'd end up crashing.Crashlandings...”可知，夜晚的人造光可能会让飞虫找不到路线，陷入危险。30.C推理判断题。根据最后一段内容，尤其“However,.in the lab,fruit flies,like oleander hawk moths-一whichcan fly in the dark-could fly over LED lights without being thrown off course."r到夹11/15