pollution
1-Noise is (A) an unwanted noise (B) an irritant (C) a source of stress (D) ...
1-A used material will be discarded if reclamation costs _ the cost of new (virgin) ...
1-Noise is (A) an unwanted noise (B) an irritant (C) a source of stress (D) ...
1-A used material will be discarded if reclamation costs _ the cost of new (virgin) ...
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