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Quiz - Cities Aim to Make Once-Polluted Rivers Safe for Swimming
July 26, 2017
Question 1 / 4
What is one thing the report says about Massachusetts' Charles River?
The river used to be open for public activities.
The water still contains a heavy amount of toxic sludge.
The city is building a large park next to the river.
The state allows swimming for a few days every year.
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Quiz - Cities Aim to Make Once-Polluted Rivers Safe for Swimming
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