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单选题
Last steps on stairs may become a high-risk accident area if they are _____.
A
not painted in a different color
B
not marked with bright tapes
C
fixed with grab bars
D
very brightly lit
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解析：
本题是细节题。从文章第二段“Mark trouble spots with bright tapes. The first and last steps...”可知，用明显的胶带或照明来突出容易摔跤的地点，可以使这些地方更容易被看到。A项“没有用不同颜色标出”，C项“安装上扶手”，D项“良好的熙明”，均与原文不符。正确答案为B。
本题是细节题。从文章第二段“Mark trouble spots with bright tapes. The first and last steps...”可知，用明显的胶带或照明来突出容易摔跤的地点，可以使这些地方更容易被看到。A项“没有用不同颜色标出”，C项“安装上扶手”，D项“良好的熙明”，均与原文不符。正确答案为B。
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