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Select the correct answer.
Flint
by Christina Rossetti
An emerald is as green as grass,
A ruby red as blood;
A sapphire shines as blue as heaven;
A flint lies in the mud.
A diamond is a brilliant stone,
To catch the world's desire;
An opal holds a fiery spark;
But a flint holds a fire.
How does Christina Rossetti's poem "Flint" contrast flint with other substances?