单选题 Steep stairs can present a particular hazard to older people.
【正确答案】 A
【答案解析】[解析] 划线词为名词,意思是“危险”,与A项danger(危险)为同义词,又如:In case of danger,raise the electric alarm.如果有危险.就拉响电动警报器。B项意为“事例”,例:Could you give us a concrete case?你能给我们举个具体事例吗?C项意为“图片”,例:All the pictures should be faced forward.所有的图片都应朝前摆。D项意为“证据”,例:The room bore evidence of a struggle.房间里有搏斗过的痕迹。