全国各地中考真题:河南省开封市2020年初中学结业考试生物试题(原卷版)
开封市2020年初中生物学结业考试一、选择题1.“老吾老以及人之老”,在生活中我们要特别关照老年人的行走和乘车安全,因为老年人骨的成分中A.有机物多于1/3,骨的弹性大,硬度小B.有机物少于1/3,骨的弹性小,硬度大C.有机物多于1/3,骨的弹性小,硬度大D.有机物少于1/3,骨的弹性大,硬度小2.临床上常用骨髓穿刺法抽取红骨髓,用来作为诊断某些血液疾病的依据,这是因为()A.红骨髓具有造血功能B.骨髓内密布毛细血管C.骨髓是滞留在骨内的血液D.血液内的病菌经常进入骨髓内3.麻雀因啄食农作物曾被列为害鸟,开展过“消灭麻雀”的运动。这种做法最主要的危害是()A.影响生物之间协调发展B.影响农作物...
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