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21.What does the underlined sentence in paragraph 1 probably mean? A.Some living species in some waters have disappeared. B.Some waters are no longer suitable for fish to live in. C.People have missed the chance to improve the water quality. D.The fish population in some waters is hard to recover to its previous level. 22.What is the greatest contributor to the decline of fish population? A.Ocean pollution. B.Government policies. C.The decline of food source. D.The rise of other living species.