题目：
根据句意和首字母提示补全单词。
1. His good friend, Mary, was k_____ in an accident.
2. My brother joined the army last year, so he became a s_____.
3. Bethune died of b_____ poisoning.
4. I most a_____ Norman Bethune. I would like to help others, too.
5. T. B. is a d_____ that damages the lungs.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：一个肿瘤的倍增时间由三个主要的因素决定：细胞周期时间、生长比例和细胞丢失速度。
