2022天一大联考t8 答案

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2022天一大联考t8
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1.B【命题意图】本题以博尔纳病毒为情境,考查病毒进入宿主细胞的方式、病毒的遗传物质组成等相关知识,体现了生命观念、科学思维、社会责任的学科素养,突出基础性、综合性、应用性的考查要求。【解题分析】博尔纳病毒属于寄生生物,该病毒没有细胞结构,而无氧呼吸和有氧呼吸是细胞生物的行为,A项错误;博尔纳病毒的遗传物质是RNA,RNA彻底水解的产物有磷酸、核糖和4种含氮碱基,共6种物质,其中有机物有5种,即核糖和4种含氮碱基,B项正确;病毒只能在活细胞中增殖,不能在马内环境中大量增殖,C项错误;博尔纳病毒侵染宿主细胞时只是将自身的核酸注入宿主细胞,不是通过被动运输进入宿主细胞的,D项错误。

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第三节One possible version:Chinas shared bicycles are gaining popularity withthe public as a cheap and convenient transport optionBike-sharing helps people enjoy an environment-friendlylife by relieving traffic and reducing pollution. Howeverthe bad behavior of some users and the mess they cause alsolead to some problems. Beijing has launched a campaignregulate bike-parking, which will hopefully set a goodexample to the rest of China