1991年广东高考生物真题
1991年广东高考生物真题一、选择题:(本大题共35个小题,每小题1分,共35分。在每小题给出的四个选项中,只有一项是符合题目要求的。把所选项前的字母填在括号内。)1.人的皮肤痛觉感受器位于 A.角质层 B.生发层 C.真皮 D.皮下组织2.下列哪一组物质是DNA的组成成分? A.脱氧核糖、核酸和磷酸 B.脱氧核糖、碱基和磷酸 c.核糖、碱基和磷酸D.核糖、嘧啶、嘌呤和磷酸3.在人体血液循环系统中,下列哪条血管的血液中氧的压力最高? A.股动脉 B.肺动脉 C.上腔静脉 D.下腔静脉4.下列哪种神经结构属于神经中枢? A.交感神经节...
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