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

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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