单项选择题

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

A．luminous
B．harmless
C．adequate
D．attractive
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单项选择题
The ultimate cause of the American Civil War was bombardment of Fort Sumter.
A．final
B．unique
C．true
D．straight
单项选择题
The ink had faded with time and so parts of the letter were illegible.
A．illiterate
B．illegitimate
C．inscrutable
D．indecipherable
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