与细菌遗传变异相关的物质有
A．嗜菌体
B．转座子
C．细菌染色体
D．抗生素
E．质粒
参考答案：A, B, C, E
________ the two designs, and you will find what problem there is with yours.
A．Comparing
B．Compared
C．To compare
D．Compare
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