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

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?

*
选项
答案D
解析 短文的第二段说，各种因素都可能导致基因改变。
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