单选题
Under what conditions will the formation of cancer begin? ( )
A、
When a chromosome breaks apart near an oncogene and its control functions fail.
B、
When people drink too much and are easy to get tired.
C、
When people smoke too much and are difficult to get to sleep.
D、
When people eat too much petroleum-based products.
【正确答案】
B
【答案解析】
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