2. 外语
  3. Cancer cells destroy not only all rival cells, in their ruthless biological warfare, but also destroy the larger organization—th

Cancer cells destroy not only all rival cells, in their ruthless biological warfare, but also destroy the larger organization—th

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问题 Cancer cells destroy not only all rival cells, in their ruthless biological warfare, but also destroy the larger organization—the body itself—signing their own suicide warrant.
选项 A、refined
B、random
C、merciless
D、perpetual
答案C
解析 ruthless意为“无情的，残忍的”。C选项：merciless意为“无情的，残忍的”，与画线的单词意义相符，如：This judge is merciless towards anyone found guilty oftourder．(这位法官对罪名成立的谋杀犯概不留情。)句意：癌细胞在残酷的生物战中不仅消灭对手，而且也破坏了更大的组织——身体本身，签署了自己的自杀授权书。故选C。A选项：refined举止优雅的，精制的；B选项：random任意的，无计划的；D选项：perpetual永久的，不断的。
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