外文改编十一选十 专项训练2-2024届高三英语一轮复习

时文改编十一选十2篇 (一) Worn-out cells eventually stop dividing A. otherwise  B. worsen C. accumulating D. eliminated E. absent F. ceaselessly G. limits H. assumed I. Removal J. decline K. automatically Cells divide many times throughout their lives. But they cannot do it _____1_____. Once they have reached the _____2_____ of their reproductive powers, they enter a state called “senescence”, in which they carry on performing their duties but stop making new copies of themselves. For years it was _____3_____ that, apart from their refusal to divide, senescent cells were _____4_____ identical to their replicating companions. There is mounting evidence, though, that this is untrue. One study in 2016 reported that senescent cells in the kidneys and heart produce a protein that causes nearby healthy tissues to _____5_____. Another study published in Nature this week, suggests the accumulation of senescent cells within the brains of mice causes the animals to develop neurodegenerative(神经退化的) diseases—and that the _____6_____ of these cells can help prevent them. Working with a team of colleagues, Dr Baker obtained a population of mice that had been genetically engineered to quickly develop fibrous tangles of protein in their brains. These tangles are associated with the _____7_____ in mental abilities caused by diseases like Alzheimer’s. When the mice were four months old, Dr Baker collected brain tissue from some, and found senescent cells _____8_____ in the hippocampus, a seahorse-shaped region of the brain involved with learning and memory. By six months old, they built up in the cerebral cortex as well—as were the tangles that are associated with neurological degeneration. To see what role, if any, senescent cells were playing in their decreasing brainpower, Dr Baker genetically altered some mice so that their senescent cells could be _____9_____ with a twice-weekly dose of a specific chemical. That left a subgroup of mice that still genetically tended to