全国各地中考真题:湖南省岳阳市2019年中考生物真题试题(含解析)
2019年湖南省岳阳市中考生物试卷一、选择题(本大题共20小题,共40分)1.生物圈中的氧气主要来自于( )A.农田生态系统B.海洋生态系统C.草原生态系统D.湿地生态系统2.下列生物实验所用常规器材中,对观察对象不具有放大作用的是( )A.目镜B.物镜C.反光镜D.放大镜3.如图中最可能是人口腔上皮细胞的是( )A.B.C.D.4.下列由细胞遗传特性改变引起的是( )A.细胞生长B.细胞分裂C.细胞分化D.细胞癌变5.种子外没有果皮包被的植物是( )A.银杏B.水稻C.花生D.豌豆6.小肠可直接吸收的物质是( )A.维生素B.淀粉C.蛋白质D.脂肪7.呼吸道不具有的功能是( )...
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