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(A) They can even be used for medical purposes.
(B) Surprisingly, not all the bacteria are drug-resistant.
(C) Nevertheless, some of them have close relatives that are harmful to people.
(D) Moreover, such super-tough bacteria are naturally widespread in the soil.
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統計: A(12), B(22), C(29), D(12), E(0) #1204301
統計: A(12), B(22), C(29), D(12), E(0) #1204301