DCACB
6.D 根据He got up and took some medicine可知他起来是为了拿药，选D。
7.C 根据Before he lay down again, he smoked. And he couldn’t go to sleep any longer可知他是躺下之前抽了烟，结果不能入睡，故选C。
8.A 根据He was afraid he had lung cancer. He seemed to see death was waiting for him. Tears(眼泪) ran down his face可知他害怕他得了肺癌，故掉眼泪了，选A。
9.C 根据And then he looked at the Xray carefully for a long time可知他做X射线是为了确定金先生的肺有没有问题，故选C。
10.B 根据Yes. Your lungs are turning black可知金先生的肺变黑了，其原因由上文可知是抽烟所致，故选B。A答案错误，医生说变黑了看不到了，是很严重；C也不对，与文章No, I don’t see anything不符；D文章没有讲到。