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  3. Many people are disturbed by the genetic diversity of cancers — an inevitable

Many people are disturbed by the genetic diversity of cancers — an inevitable

游客2025-03-26  37
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. [br] 【C4】
选项 A、in place of
B、in support of
C、in exchange for
D、in response to
答案 D
解析 in place of：取代(instead of)；in support of：支持；in exchange for：交换；in response to：对……做出反应，响应……。该句的意义是：由于治疗，癌细胞逐渐适应环境并演化。
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