第3题: [单项选择]丙型肝炎病毒下列哪项叙述不正确 A. 为单股正链RNA病毒 B. 可应用血源疫苗免疫以预防感染 C. 血清中检测出anti-HCV提示有感染 D. 血清中可检测病毒RNA E. 绝大多数为血源传播 参考答案:B
第4题: [填空题]The researchers publish their findings. 参考答案:A 答案解析:Para 4: research suggests that it is the process of keeping clean that may be making indoor pollutio