Question: Of the following metals, which one pollutes the air of a big city?
(a) Copper
(b) Cadmium
(c) Lead
(d) Chromium
Answer: (c) Lead
Question: Of the following metals, which one pollutes the air of a big city?
(a) Copper
(b) Cadmium
(c) Lead
(d) Chromium
Answer: (c) Lead
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