Steep stairs can present a particular ha

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问题 Steep stairs can present a particular hazard to old people.

选项 A:pictureB:dangerC:evidenceD:case

答案B

解析陡峭的楼梯对老年人特别危险。hazard和danger意思相近,都表示危险。picture:图片 图画;evidence:证据,迹象;case:情况。
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