請依下文回答第 47～50 題，各題答案內容不重複
That so many bacteria have become drug-resistant is testimony to the microbes’ toughness. However, here is
tougher: some bacteria actually eat antibiotics for breakfast. 47
To study bacteria with varying degrees of prior exposure to artificial antibiotics, a research team sampled dirt from
eleven disparate locations. 48 All eleven soil types sheltered bacteria that could grow on antibiotics—including
commonly prescribed ones—as their only source of carbon. 49
To be able to eat antibiotics, those bacteria must obviously have a high degree of resistance. Indeed, they tolerate
antibiotics at an extremely concentrated level. The poison-munching bacteria are not harmful to people. 50 Because
bacteria swap genes freely, scientists warn that the soil dwellers might be able to transfer the genes for super-resistance to
their infective cousins.
【題組】49 (A) Fortunately, not many can be found in the soil.
(B) Then they exposed the samples to eighteen antibiotics.
(C) Also, the antibiotics can be natural ones like penicillin.
(D) What is more, all but one of the antibiotics became food for bacteria in most soil types.
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