Phosphorus is used in paints for highway signs and marks because it is bright at night.

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问题 Phosphorus is used in paints for highway signs and marks because it is bright at night.

选项 A、luminous
B、harmless
C、adequate
D、attractive

答案A

解析 bright明亮的。luminous发光的，发亮的；harmless无害的；adequate足够的；attractive有吸引力的。故选A项。

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