【科学60秒】大象：动物界的SUV_英语听力练习mp3下载-自然-沪江听力酷

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【科学60秒】大象：动物界的SUV

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Elephants. They’re the SUVs of the animal kingdom. They’re big and rugged, and can carry lots of cargo. And now a study in the Proceedings of the National Academy of Sciences suggests they ___1___ the quadruped version of all-wheel drive.
When it comes to locomotion, elephants are not exactly ___2___ of foot. And they seem to hold their legs straighter than other animals do, at least when they walk. So scientists set out to examine more closely how elephant limbs mechanically ___3___.
Six Asian elephants walked or ran over a sidewalk equipped with pressure sensors, as the scientists used high-speed video cameras to monitor their gait. And they found that elephant legs actually do bend enough to provide significant leverage when on the move. More surprising is that pachyderms’ front and rear legs are ___4___ when it comes to acceleration and braking. All other four-legged animals, like dogs or cats or horses, divvy up those duties. With their rear legs powering the push forward, and their front legs acting as brakes.
That arrangement lets elephants ___5___. Sadly, it does nothing for their fuel economy. Of course, they do have the roomiest trunk.