A. Does cancer always cause pain? B. Can cancer be prevented? C. What is cancer? D. How common is cancer? E. What causes cancer?

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问题 A. Does cancer always cause pain?
B. Can cancer be prevented?
C. What is cancer?
D. How common is cancer?
E. What causes cancer?
F. How is cancer treated?

A. prescription medicines
B. control or order
C. tolerance for pain
D. various factors
E. normal genes
F. side effects

选项

答案B

解析 短文的第一段说,身体里的细胞无限制或者是无秩序地分化时癌症便产生了。
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