A、Six months. B、Six to twelve months. C、Twelve months. D、More than a year. B新闻中提到，要想通过测试，这些狗需要接受六到十二个月之久的艰苦训练。

(5)When devastating earthquakes hit Haiti, Japan and Nepal, rescue dogs were among the first to arrive. American search-and-rescue teams and their specially trained dogs also helped during the US hurricanes Katrina and Sandy.
    Ron Sanders and his 6-year old Labarador, Pryse, were part of a US team to help find survivors in Nepal. Sanders, a retired firefighter, says Pryse and the other special canines, are essential to the team. The dogs obviously have a wonderful sense of smell. So they can quickly determine where the scent is coming from and hone in on that location that we need to dig down. The dogs can also navigate quickly through collapsed buildings and squeeze through tight spots to find victims.(6)For the dogs, the job is a fun and playful adventure. They want to go find that person, to play with that person. But becoming a rescue dog is serious business.(7)To become certified, the dogs train long and hard for six to twelve months. What helps them get there is lots of practice.
5. What is the news report mainly about?
6. What is the rescue job like for the dogs?
7. How long does it need to train certified rescue dogs?