考查细节理解。根据第一段第三句“A few years back we started this sort of ‘favor war’， where one of us would do something for the other, such as shoveling (铲) his driveway or helping him build a shed, and next time the other would try to top it with another favor”可知，几年前我们就开始这种“互相活动”，一个人帮助另一个人之后，下一次便由对方提供帮助；据此可知，作者和Orlando总是乐意互相帮助，故D项正确。

6．Who saved the boy before it was too late?

A．The writer. B．The boy's parents.

C．Orlando and his wife.     D．Orlando and his partner.

解析：D　考查细节理解。根据第三段第五句“Luckily he and his partner were only about 2 minutes away, but the next closest ambulance was in 10 minutes”，并结合该段内容可知，Orlando和他的搭档离医院只有大约两分钟的车程，他们很快上班挽救了男孩的生命，故D项正确。