第3题: [单项选择]克服乏氧细胞放射抗拒性的措施.你认为在理论上不可行的是() A. 高压氧应用 B. 高氧和低氧联合应用 C. 乏氧细胞增敏剂 D. 使用抗VEGF类药物 E. 使用活血化瘀的中药 参考答案:D 答案解析:在理论上要克服乏氧细胞的放射抗拒性,需要增加肿瘤组织的氧浓度或改善肿瘤组织的血供状况,本题中D选项不能达到类似效果。
A. most sharks are dangerous to human beings B. sharks only attack someone in black wet suits C. movies and popular novels are always misleading D. sharks are a valuable resource for human beings 参考答案:D 答案解析:推断题。根据第三、四段可知鲨鱼对人类来说价值很高,故答案为D。
第21题: [单项选择]The woman stopped the car because ______. A. the old woman asked her to B. she recognized the old woman C. she knew what the woman wanted D. she wanted to help the old woman out in the bad weather 参考答案:D