27.What can be a suitable title for the text A.Follow Me B.Brave the Storm C.Never Wander Alone D.Always Trust Strangers C A study published in Nature on July 16th offers the strongest evidence that the urge to sleep is caused by a build-up of electrons in the mitochondria()of certain brain cells.If true,sleep may have originally emerged as a way of repairing mitochondria,with its other benefits evolving later. Mitochondria,which exist in almost all human and animal cells,supply energy by taking electrons from fuel molecules()obtained from food.However,some electrons leak out during this process.These leaked electrons react with oxygen to create harmful by-products-if these substances build up,they will damage cells.The new study points out that when sleep-control neurons detect too much mitochondrial damage,they cause sleep.These neurons work like circuit-breakers:they make the brain fall into sleep before too many electrons accumulate,preventing further harm.Sleep then restores the balance of electrons and fixes damaged mitochondria. To test this idea,scientists did experiments on fruit flies.First,they labelled the flies' sleep-control neurons (called dorsal fan-shaped body neurons,dFBNs)with a glowing protein.Then,they disrupted the flies'sleep by keeping them in constant motion for 12 hours. After the experiment,the scientists observed the dFBNs under a microscope.They found that the mitochondria in these neurons had broken apart-a sign that electrons had caused damage.But once the flies got some sleep,the mitochondria joined back together, just like fixing a broken object. Ivana Rosenzweig,a specialist in sleep neuroscience,describes the findings as a "significant conceptual shift".Since energy supply is linked to sleep in many species, electron build-up may also cause sleep pressure in humans.The study's authors note that people with mitochondrial disorders often feel unusually sleepy,and they hope the research will help solve sleep disorders and tiredness-related problems. 28.What can we know from the first two paragraphs A.Sleep may initially fix mitochondria. B.Mitochondria take electrons from food. C.Electrons leakage damages cells directly. D.Neurons cause sleep when electrons leak. 第6页共12页2025年高三年级12月考试 英语试卷 注意事项： 1.答题前，先将自己的姓名、准考证号填写在试卷和答题卡上，并将准考证号 条形码粘贴在答题卡上的指定位置。 2.选择题的作答：每小题选出答案后，用2B铅笔把答题卡上对应题目的答案 标号涂黑。写在试卷、草稿纸和答题卡上的非答题区域均无效。 3.非选择题的作答：用黑色签字笔直接答在答题卡上对应的答题区域内。写在 试卷、草稿纸和答题卡上的非答题区域均无效。 4.考试结束后，请将答题卡上交。 第一部分听力（共两节，满分30分） 做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷 上的答案转涂到答题卡上。 第一节（共5小题；每小题1.5分，满分7.5分) 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中 选出最佳选项。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一 小题。每段对话读两遍。 1.What cuisi ... ...
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