第15题: [单项选择]A. To discover the side effects of thermographs. B. To improve the analysis of blood and tissue samples. C. To find out why a body requires rest. D. To get a better understanding of illness. 参考答案:D 答案解析:[听力原文] Why are scientists studying variations in body temperature
第18题: [单项选择]可以治疗痛风的药物是 A. 甲氨蝶呤 B. 阿糖胞苷 C. 氟尿嘧啶 D. 别嘌呤醇 E. 以上都不是 参考答案:D 答案解析:[解析] 甲氨蝶呤是叶酸类似物,竞争性抑制二氢叶酸还原酶,干扰嘌呤碱的合成;氟尿嘧啶是胸苷酸合酶抑制剂,阻断TMP的合成;阿糖胞苷抑制CDP还原成dCDP,并能在细胞内激酶的作用下转化为三磷酸衍生物干