人的卷舌性状由一对基因控制，卷舌是显性，不卷舌是隐性。卷舌基因用A表示，不卷舌...

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75.人类在进行亲子鉴定时，所提取的DNA来自人体细胞的 _____

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观察下面植物细胞和人体细胞的结构示意图，据图回答第74～75小题。74.与人体细胞相...

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54.该农田生态系统的食物网中，食物链条数为 ( )

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下面为某农田生态系统的食物网示意图，据图回答第53～55小题.53.该农田生态系统中...

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45.健康人的尿液中不含蛋白质.葡萄糖。下表是某健康人血浆.原尿.尿液成分的化验数...

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31、读上图回答以下问题：（12分）⑴山脉A是_____，其南侧的地形区是_____。⑵山脉...

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我们的生活离不开交通，交通运输被称为发展经济的“先行官”。读下面的几种交通运...

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32．Ⅲ区域气候干旱，但由东向西干湿程度不同，造成地理环境差异。下列自然景观按...

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下图表示“我国重要的地理分界线”，读图并结合相关知识完成30—32题。30．表示我...

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