A.By changing O2 into CO
B.By destroying the haemoglobin
C.By forming a stable compound with haemoglobin
D.By obstructing the reaction of O2 with haemoglobin
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B.By destroying the haemoglobin
C.By forming a stable compound with haemoglobin
D.By obstructing the reaction of O2 with haemoglobin
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