Steep stairs can present a particular hazard to older people.A:evidence B:danger

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

选项 A:evidence
B:danger
C:case
D:picture

答案B

解析本句意思：陡峭的楼梯对老人来说特别危险。hazard和danger意思相同，表示“危险”。

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