Am I ready to study in English? - Life Learners Training ...
(a) Cholera and Typhoid fever can be carried in water polluted by sewage. (b) Oxygen released from sewage smells unpleasant. (a) is correct. (b) is incorrect, because the smell is caused by gases given off by bacteria which survive when there is no oxygen present. Question 2 (a) Some bacteria use oxygen to break down sewage. ................
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