Steep stairs can present a particular hazard to old people.A:picture B:danger C:

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

选项 A:picture
B:danger
C:evidence
D: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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