英语四六级考试中的听力部分一直以来都是同学们的难点，也是吐槽最多的部分。这不仅需要听力技巧，更要平时的练习积累，小编为大家准备了四级听力的慢速资料，一起来练习一下英语四级听力题吧。

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　　A Dog's Sniffer Could Be Your Best Friend inDisaster

　　When devastating earthquakes hit Haiti, Japan andNepal, rescue dogs were among the first to arrive.

　　American search-and-rescue teams and theirspecially trained dogs also helped during U.S.hurricanes Katrina and Sandy.

　　Ron Sanders and his 6-year old Labarador, Pryse, were part of a U.S. team to help findsurvivors in Nepal.

　　Sanders, a retired firefighter, says Pryse and the other special canines, are essential to theteam.

　　"The dogs obviously have a wonderful sense of smell. So they can quickly determine where thescent is coming from and hone in that location that we need to dig down."

　　The dogs can also navigate quickly through collapsed buildings and squeeze through tightspots to find victims.

　　For the dogs, the job is a fun and playful adventure. "They want to go find that person, toplay with that person."

　　But becoming a rescue dog is serious business. To become certified, the dogs train long andhard for six to 12 months.

　　What helps them get there is lots of practice.

　　They train in Virginia. A former prison has been made to look like a disaster site. The dogslearn to follow hand signals and voice commands while running on narrow planks of wood. Theygo up and down ladders, walk over rough terrain, and search in the rubble for survivors.

　　Finding one, which they almost always do, is the ultimate reward.

　　"So we're looking for that ability to play, intelligence, great agility, of course, because we'regoing to ask them to climb on things that are very unnatural for a dog to climb on."

　　The dogs also train on helicopters because roads might be impassable in a disaster. The dogsare taught to get in and out of a helicopter while it's on the ground and running. They becomeused to the noise, the vibrations, and the wind from the helicopter blades.

　　They are picked up from the ground in a special harness, too, and lifted through the air intothe helicopter.

　　"It teaches them to trust us and to know that it will be all right," says Sanders.

　　At the end of the day, it's all about trust between the trainers and the dogs, says Sanders.Being trained and ready can make the difference between life and death, he says.

　　1.rubble 瓦砾;废墟

　　After the war many cities were full of rubble.

　　战后许多城市到处可见颓垣残壁。

　　2.hurricane 飓风

　　They had to rebuild their homes after the havoc of the hurricane.

　　遭受飓风的巨大破坏后,他们不得不重建家园。

　　3.scent 气味;香味

　　The hounds were on the scent of a fox.

　　猎狗找到了一只狐狸的臭迹。

　　4.navigate 航行;穿过;驾驶

　　You don’t need a lot of signposts to navigate successfully. They just need to be visible.

　　不需要大量导航标志来成功导航，它们只要是可见就行了。

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