A.Natural resistance is usually linked to the presence of a gene in the chromosomal position.
B
B.Natural resistance is usually due to the acquisition of foreign genetic material.
C
C.Natural resistance is favored by the use of antibiotics.
正确答案：
A gene in chromosomal position can encode a natural resistance. When it is mutated, it can encode an acquired resistance. Plasmids are acquired and can bring new resistances (acquired)
