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  3. Many people are disturbed by the genetic diversity of cancers — an inevitable consequence of random evolution. Cancer therapies【

Many people are disturbed by the genetic diversity of cancers — an inevitable consequence of random evolution. Cancer therapies【

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问题    Many people are disturbed by the genetic diversity of cancers — an inevitable consequence of random evolution. Cancer therapies【C1】______be applied fairly randomly or carelessly, but nowadays many believe that effective therapies need to be【C2】______and tailored to genetic faults in each individual’s cancer.
   However, a personalized treatment disregards the most fundamental reason why it is difficult to cure cancers【C3】______: cancer cells adapt and evolve【C4】______treatment. Even drugs that are initially effective often have a【C5】______diminishing effect, as the biological systems blocked by the treatment spontaneously compensate【C6】______re-routing the cancer cells’ internal wiring,【C7】______the cancer’s ability to spread. To use an【C8】______, traffic hot spots in towns can cause major traffic jams, but smart drivers will quickly find other short cuts. Then, in the absence of "short cuts", evolution【C9】______: naturally arising mutant cancer cells that are【C10】______the targeted drug rapidly outgrow their disabled siblings and cancer comes back.
【C6】
选项 A、for
B、between
C、during
D、by
答案D
解析 该选项可能有些难，容易上当。本句中的re-routing the cancer cells’internal wiring的含义是“重新设计癌细胞的内部线路”，是人体某些生物系统对抗药物治疗的方式。compensate(补偿，弥补)确实接介词for，但compensate for rerouting the cancer cells’internal wiring的意义是“对重新设计癌细胞的内部线路做出赔偿”，这听起来有“悔罪”的意图，应该对健康有益，显然不符合逻辑。介词during几乎不接doing，而by doing…的含义是“通过做……”，更符合逻辑。
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