在“探究鱼类适应水中生活特征”的实验中,某生物兴趣小组正在激烈讨论。分析回答7...
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下面是桃花结构示意图,据图回答74——75题。74、图中内含花粉的结构是
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64、在“观察洋葱鳞片叶表皮细胞临时装片”时,可以使用不同的显微镜镜头组合,如...
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人的卷舌性状是由一对基因控制的,卷舌性状由显性基因(A)控制,不卷舌性状由隐性...
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下面为蚕豆种子的结构示意图,据图回答17——18题。57、种子萌发后,将来能发育成...
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下面为某生态系统示意图,据图回答15——16题。55、该生态系统中的鼠属于
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48、在植物蒸腾作用的实验中,选取两种植物上两株大小相同的枝条,依下面A图所示的...
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47、在“探究种子萌发的外界条件”的实验中,用相同的三粒菜豆种子进行如右图所示...
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图14中的甲、乙、丙、丁分别代表我国的四大地理区域,结合相关知识回答39~40题。3...
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