参考答案

正确答案：D
解析：此题属推理题，问“作者写第三段和第四段的目的是什么”。短文在第二段中指出了医生对睡眠不足缺乏重视，接下来在第三段中举了一个例子“I was operating after being up for over 36hours；…I literally fell asleep standing up and nearly face planted into the wound．”这个医生因缺觉在做手术时，脸差点碰到病人伤口；紧接着在第四段里又举了几个例子：“‘Practically every surgical resident I know has fallen asleep at the wheel driving home from work．’writes another.‘Iknow of three who have hit parked cars．Another hit a‘Jersey barrier’on the New Jersey Turnpike，going 65 m．p．h．”’这些例子说的是医生开车时在方向盘上睡着；医生撞车；医生撞到公路收费站栏杆。由此可见作者写这两段的目的就是要“举例说明医生睡眠不足可能带来的危害”，故选D。