第28题: [单项选择]When did Lindbergh learn to drive an automobile A. Because mechanical engineering was too boring. B. Because he wanted to be a flier. C. Because he was more interested in farming. 参考答案:B 答案解析:[解析] 推理题。根据所听材料中He did not finish college because he had decided to become a flier After that decisi
第35题: [单项选择]肠道病毒的流行病学特征不包括() A. 在世界上传播很广,没有严格的地区性 B. 不同种类和型别的肠道病毒感染的流行季节不完全相同 C. 人群普遍易感,但学龄前儿童患者的比例显著高于青少年和成年人 D. 隐性感染者不是肠道病毒感染的传染源 E. 接触传播是肠道病毒感染的主要传播方式 参考答案:D