问题描述：
It looks like hard work.
It looks like hard work,but hopping actually lets the kangaroo conserve more energy than another animal could when running on four legs.
俄．．一道旧托听力．．我听得是 哈平 ．．可是答案是hopping．．
It looks like hard work,but hopping actually lets the kangaroo conserve more energy than another animal could when running on four legs.
俄．．一道旧托听力．．我听得是 哈平 ．．可是答案是hopping．．
问题解答：
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