On October 14, 2015 tracker dogs led game scouts to a group of armed poachers who were on the run after shooting and killing a w

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问题    On October 14, 2015 tracker dogs led game scouts to a group of armed poachers who were on the run after shooting and killing a well-known old elephant bull just outside Tarangire National Park, Tanzania. This was the latest in a string of successes by Tanzania’s tracker dogs, which are proving to be an effective weapon in the bloody war on elephant poaching in East Africa.
   "Apart from their incredible tracking abilities, dogs are wonderful to work with because they don’t have any political agenda—they can’t be compromised," said Damien Bell, director of Big Life Tanzania, the conservation organization that manages the Big Life Tracker Dog Unit. "Our dogs have tracked elephant poachers for up to eight hours at a time or more, through extreme conditions—heat, rain, wetlands, mountains—and still turned up results," he said. "They love their handlers, and they do a job until the job is done. "
   The Big Life Foundation first began using dogs for anti-poaching efforts in 2011, after adopting four Alsatians(German shepherds)from kennels in the Netherlands and honing their skills with the help of Canine Specialist Services International, a dog training facility based in northern Tanzania.
   Alsatians were picked over bloodhounds as they have more stamina and can better handle the African heat.
   Two of the dogs, Max and Jazz, were stationed in southern Kenya. The other two, Rocky and Jerry, were sent to Tanzania to help out in the Amboseli/Kilimanjaro ecosystem, important elephant habitat that straddles the two countries. Since their arrival, Rocky and Jerry have helped with countless anti-poaching operations, leading to numerous arrests. In fact, the dog teams have become so popular that Tanzania National Parks , the Wildlife Division, the police, and even the military have requested their assistance.
   Canine sleuths aren’t limited to the plains of East Africa, either. In the Democratic Republic of the Congo, bloodhounds are assisting in the fight against poaching in forested Virunga National Park, where the world’s last remaining mountain gorillas live.
   In South Africa, Weimaraner and Malinois dogs are helping to find wounded animals and track poachers on foot through the reserves around Kruger National Park. Anatolian shepherd dogs are also used in Africa to mitigate human-wildlife conflict on farms, where the instinctively protective dogs defend livestock from predators.
   Rocky arrived with his handlers, and soon he was pacing and sniffing up and down beside the dead elephant, about to explode with excitement. He quickly picked up the human scents from footprints near the carcass. It seemed that multiple people had been at the crime scene the night before. Now the dogs were on their dusty trail.
   The hunters had become the hunted.
   Rocky led the chase through the foothills and scrublands of the Lesimingori, frantically tugging his handler at the end of the lead. But after five hours of relentless progress, the heat wore even him down, and his protege, Rosdus, took over. Rosdus is a new dog on the team—fresh from extensive training at Canine Specialist Services International, at Usa River. Rosdus didn’t disappoint his mentor. He took the team all the way to the main highway, where the unit followed a hot trail through the town and to a particular home. There,seven suspects were arrested. Six of the suspects have been charged and are now in custody in Arusha, without bail.
The word "mitigate"(para. 7)is closest in meaning to______.

选项 A、reduce
B、protect
C、aggravate
D、avoid

答案A

解析
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