44 Which of the following statements about bacteria in sewer pipes is true? 

(A)They are of one species. 

(B)They could all be cultured. 

(C)They have undergone mass DNA screening in Dr. Hernandez’ experiment. 

(D)They helped reduce sulphuric acid in sewer pipes.

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統計: A(8), B(22), C(96), D(24), E(0) #982457

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