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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
First, multiple-choice questions: This topic has a total of 35 small questions, each question 1 points, a total of 35 points. Of the four options given in each question, only one is in line with the requirements of the title. Put the letter before the option in parentheses. 1. Human skin pain receptors are located in () A. The stratum corneum B. The germinal layer C. The dermis D. The subcutaneous tissue 2. Which of the following groups of substances is a component of DNA? () A. Deoxyribose, nucleic acid, and phosphoric acid. Deoxyribose, bases and phosphoric acid C. Ribose, bases and phosphoric acid D. Ribose, pyrimidines, purines and phosphoric acid 3. Which of the following blood vessels is in the bloodstream?