Read the passage from a product recall notice. On heavily salted roads, the wheels weakened on the skateboard models listed below. At first, only tiny cracks appeared in them. Prolonged exposure, though,

Read the passage from a product recall notice.

On heavily salted roads, the wheels weakened on the skateboard models listed below. At first, only tiny cracks appeared in them. Prolonged exposure, though, caused those cracks to spread rapidly.

Which phrase is most helpful in determining the meaning of the word prolonged?

1.spread

2.At first

3.weakened

4.tiny cracks

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