https://online2.tingclass.net/lesson/shi0529/0008/8490/60.mp3
https://image.tingclass.net/statics/js/2012
30. Although most birds have only a negligible sense of smell, they have _____ vision.
A. vigorous B. exact C. acute D. vivid
vigorous 精力旺盛的, 有力的, 健壯的
exact 確切的, 精確的, 準確的
vivid 生動的, 形象的, 鮮明的
acute 敏銳的
vision 視力, 眼界
