第3题: [单项选择]某地区的队列研究如下:下列论述哪项是错误的()。 A. 不论哪一组都是肺癌的吸烟相对危险性大于冠心病的吸烟相对危险性 B. 吸烟者总的相对危险性,肺癌的是:(40+60)÷2/10=5.0(冠心病用同样方法计算的是1.4) C. 肺癌的吸烟特异危险性与冠心病的吸烟特异危险性相等 D. 肺癌的吸烟AR%与冠心病的吸烟AR%则不相等。 E. 吸烟开始年龄与两种疾病疾病率有关 参考答案:B
第19题: [单项选择]What time is it now A. 8:45. B. 8:15. C. 9:15. 参考答案:A 答案解析:[听力原文] F: Well, could you tell me why the library is not open yet M: It’s not nine yet. We st
A. Olympic athletes in training. B. City lifeguards. C. Students who are poor runners. D. Students taking a fitness test. 参考答案:D 答案解析:[听力原文] May I have the attention of all students We are about to have the running test. This